Elasticsearch

Since Camel 3.19

Only producer is supported

The ElasticSearch component allows you to interface with an ElasticSearch 8.x API using the Java API Client library.

Maven users will need to add the following dependency to their pom.xml for this component:

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-elasticsearch</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

URI format

elasticsearch://clusterName[?options]

Configuring Options

Camel components are configured on two separate levels:

  • component level

  • endpoint level

Configuring Component Options

At the component level, you set general and shared configurations that are, then, inherited by the endpoints. It is the highest configuration level.

For example, a component may have security settings, credentials for authentication, urls for network connection and so forth.

Some components only have a few options, and others may have many. Because components typically have pre-configured defaults that are commonly used, then you may often only need to configure a few options on a component; or none at all.

You can configure components using:

  • the Component DSL.

  • in a configuration file (application.properties, *.yaml files, etc).

  • directly in the Java code.

Configuring Endpoint Options

You usually spend more time setting up endpoints because they have many options. These options help you customize what you want the endpoint to do. The options are also categorized into whether the endpoint is used as a consumer (from), as a producer (to), or both.

Configuring endpoints is most often done directly in the endpoint URI as path and query parameters. You can also use the Endpoint DSL and DataFormat DSL as a type safe way of configuring endpoints and data formats in Java.

A good practice when configuring options is to use Property Placeholders.

Property placeholders provide a few benefits:

  • They help prevent using hardcoded urls, port numbers, sensitive information, and other settings.

  • They allow externalizing the configuration from the code.

  • They help the code to become more flexible and reusable.

The following two sections list all the options, firstly for the component followed by the endpoint.

Component Options

The Elasticsearch component supports 15 options, which are listed below.

Name Description Default Type

connectionTimeout (producer)

The time in ms to wait before connection will time out.

30000

int

enableDocumentOnlyMode (producer)

Indicates whether the body of the message contains only documents. By default, it is set to false to be able to do the same requests as what the Document API supports (see https://www.elastic.co/guide/en/elasticsearch/reference/current/docs.html for more details). To ease the migration of routes based on the legacy component camel-elasticsearch-rest, you should consider enabling the mode, especially if your routes do update operations.

false

boolean

hostAddresses (producer)

Comma separated list with ip:port formatted remote transport addresses to use. The ip and port options must be left blank for hostAddresses to be considered instead.

String

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

maxRetryTimeout (producer)

The time in ms before retry.

30000

int

socketTimeout (producer)

The timeout in ms to wait before the socket will time out.

30000

int

autowiredEnabled (advanced)

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

boolean

client (advanced)

Autowired To use an existing configured Elasticsearch client, instead of creating a client per endpoint. This allows customizing the client with specific settings.

RestClient

enableSniffer (advanced)

Enable automatically discover nodes from a running Elasticsearch cluster. If this option is used in conjunction with Spring Boot, then it’s managed by the Spring Boot configuration (see: Disable Sniffer in Spring Boot).

false

boolean

sniffAfterFailureDelay (advanced)

The delay of a sniff execution scheduled after a failure (in milliseconds).

60000

int

snifferInterval (advanced)

The interval between consecutive ordinary sniff executions in milliseconds. Will be honoured when sniffOnFailure is disabled or when there are no failures between consecutive sniff executions.

300000

int

certificatePath (security)

The path of the self-signed certificate to use to access to Elasticsearch.

String

enableSSL (security)

Enable SSL.

false

boolean

password (security)

Password for authenticating.

String

user (security)

Basic authenticate user.

String

Endpoint Options

The Elasticsearch endpoint is configured using URI syntax:

elasticsearch:clusterName

With the following path and query parameters:

Path Parameters (1 parameters)

Name Description Default Type

clusterName (producer)

Required Name of the cluster.

String

Query Parameters (20 parameters)

Name Description Default Type

connectionTimeout (producer)

The time in ms to wait before connection will time out.

30000

int

disconnect (producer)

Disconnect after it finish calling the producer.

false

boolean

enableDocumentOnlyMode (producer)

Indicates whether the body of the message contains only documents. By default, it is set to false to be able to do the same requests as what the Document API supports (see https://www.elastic.co/guide/en/elasticsearch/reference/current/docs.html for more details). To ease the migration of routes based on the legacy component camel-elasticsearch-rest, you should consider enabling the mode, especially if your routes do update operations.

false

boolean

from (producer)

Starting index of the response.

Integer

hostAddresses (producer)

Comma separated list with ip:port formatted remote transport addresses to use.

String

indexName (producer)

The name of the index to act against.

String

maxRetryTimeout (producer)

The time in ms before retry.

30000

int

operation (producer)

What operation to perform.

Enum values:

  • Index

  • Update

  • Bulk

  • GetById

  • MultiGet

  • MultiSearch

  • Delete

  • DeleteIndex

  • Search

  • Exists

  • Ping

ElasticsearchOperation

scrollKeepAliveMs (producer)

Time in ms during which elasticsearch will keep search context alive.

60000

int

size (producer)

Size of the response.

Integer

socketTimeout (producer)

The timeout in ms to wait before the socket will time out.

30000

int

useScroll (producer)

Enable scroll usage.

false

boolean

waitForActiveShards (producer)

Index creation waits for the write consistency number of shards to be available.

1

int

lazyStartProducer (producer (advanced))

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

documentClass (advanced)

The class to use when deserializing the documents.

ObjectNode

Class

enableSniffer (advanced)

Enable automatically discover nodes from a running Elasticsearch cluster. If this option is used in conjunction with Spring Boot, then it’s managed by the Spring Boot configuration (see: Disable Sniffer in Spring Boot).

false

boolean

sniffAfterFailureDelay (advanced)

The delay of a sniff execution scheduled after a failure (in milliseconds).

60000

int

snifferInterval (advanced)

The interval between consecutive ordinary sniff executions in milliseconds. Will be honoured when sniffOnFailure is disabled or when there are no failures between consecutive sniff executions.

300000

int

certificatePath (security)

The certificate that can be used to access the ES Cluster. It can be loaded by default from classpath, but you can prefix with classpath:, file:, or http: to load the resource from different systems.

String

enableSSL (security)

Enable SSL.

false

boolean

Message Headers

The Elasticsearch component supports 10 message header(s), which is/are listed below:

Name Description Default Type

operation (producer)

Constant: PARAM_OPERATION

The operation to perform.

Enum values:

  • Index

  • Update

  • Bulk

  • GetById

  • MultiGet

  • MultiSearch

  • Delete

  • DeleteIndex

  • Search

  • Exists

  • Ping

ElasticsearchOperation

indexId (producer)

Constant: PARAM_INDEX_ID

The id of the indexed document.

String

indexName (producer)

Constant: PARAM_INDEX_NAME

The name of the index to act against.

String

documentClass (producer)

Constant: PARAM_DOCUMENT_CLASS

The full qualified name of the class of the document to unmarshall.

ObjectNode

Class

waitForActiveShards (producer)

Constant: PARAM_WAIT_FOR_ACTIVE_SHARDS

The index creation waits for the write consistency number of shards to be available.

Integer

scrollKeepAliveMs (producer)

Constant: PARAM_SCROLL_KEEP_ALIVE_MS

The starting index of the response.

Integer

useScroll (producer)

Constant: PARAM_SCROLL

Set to true to enable scroll usage.

Boolean

size (producer)

Constant: PARAM_SIZE

The size of the response.

Integer

from (producer)

Constant: PARAM_FROM

The starting index of the response.

Integer

enableDocumentOnlyMode (producer)

Constant: PARAM_DOCUMENT_MODE

Indicates whether the body of the message contains only documents.

false

Boolean

Message Operations

The following ElasticSearch operations are currently supported. Set an endpoint URI option or exchange header with a key of "operation" and a value set to one of the following. Some operations also require other parameters or the message body to be set.

operation message body description

Index

Map, String, byte[], Reader, InputStream or IndexRequest.Builder content to index

Adds content to an index and returns the content’s indexId in the body. You can set the name of the target index by setting the message header with the key "indexName". You can set the indexId by setting the message header with the key "indexId".

GetById

String or GetRequest.Builder index id of content to retrieve

Retrieves the document corresponding to the given index id and returns a GetResponse object in the body. You can set the name of the target index by setting the message header with the key "indexName". You can set the type of document by setting the message header with the key "documentClass".

Delete

String or DeleteRequest.Builder index id of content to delete

Deletes the specified indexName and returns a Result object in the body. You can set the name of the target index by setting the message header with the key "indexName".

DeleteIndex

String or DeleteIndexRequest.Builder index name of the index to delete

Deletes the specified indexName and returns a status code in the body. You can set the name of the target index by setting the message header with the key "indexName".

Bulk

Iterable or BulkRequest.Builder of any type that is already accepted (DeleteOperation.Builder for delete operation, UpdateOperation.Builder for update operation, CreateOperation.Builder for create operation, byte[], InputStream, String, Reader, Map or any document type for index operation)

Adds/Updates/Deletes content from/to an index and returns a List<BulkResponseItem> object in the body You can set the name of the target index by setting the message header with the key "indexName".

Search

Map, String or SearchRequest.Builder

Search the content with the map of query string. You can set the name of the target index by setting the message header with the key "indexName". You can set the number of hits to return by setting the message header with the key "size". You can set the starting document offset by setting the message header with the key "from".

MultiSearch

MsearchRequest.Builder

Multiple search in one

MultiGet

Iterable<String> or MgetRequest.Builder the id of the document to retrieve

Multiple get in one

You can set the name of the target index by setting the message header with the key "indexName".

Exists

None

Check whether the index exists or not and returns a Boolean flag in the body.

You must set the name of the target index by setting the message header with the key "indexName".

Update

byte[], InputStream, String, Reader, Map or any document type content to update

Updates content to an index and returns the content’s indexId in the body. You can set the name of the target index by setting the message header with the key "indexName". You can set the indexId by setting the message header with the key "indexId". Be aware of the fact that unlike the component camel-elasticsearch-rest, by default, the expected content of an update request must be the same as what the Update API expects, consequently if you want to update one part of an existing document, you need to embed the content to update into a "doc" object. To change the default behavior, it is possible to configure it globally at the component level thanks to the option enableDocumentOnlyMode or by request by setting the header ElasticsearchConstants.PARAM_DOCUMENT_MODE to true.

Ping

None

Pings the Elasticsearch cluster and returns true if the ping succeeded, false otherwise

Configure the component and enable basic authentication

To use the Elasticsearch component, it has to be configured with a minimum configuration.

ElasticsearchComponent elasticsearchComponent = new ElasticsearchComponent();
elasticsearchComponent.setHostAddresses("myelkhost:9200");
camelContext.addComponent("elasticsearch", elasticsearchComponent);

For basic authentication with elasticsearch or using reverse http proxy in front of the elasticsearch cluster, simply setup basic authentication and SSL on the component like the example below

ElasticsearchComponent elasticsearchComponent = new ElasticsearchComponent();
elasticsearchComponent.setHostAddresses("myelkhost:9200");
elasticsearchComponent.setUser("elkuser");
elasticsearchComponent.setPassword("secure!!");
elasticsearchComponent.setEnableSSL(true);
elasticsearchComponent.setCertificatePath(certPath);

camelContext.addComponent("elasticsearch", elasticsearchComponent);

Index Example

Below is a simple INDEX example

from("direct:index")
  .to("elasticsearch://elasticsearch?operation=Index&indexName=twitter");
<route>
    <from uri="direct:index"/>
    <to uri="elasticsearch://elasticsearch?operation=Index&amp;indexName=twitter"/>
</route>

For this operation, you’ll need to specify an indexId header.

A client would simply need to pass a body message containing a Map to the route. The result body contains the indexId created.

Map<String, String> map = new HashMap<String, String>();
map.put("content", "test");
String indexId = template.requestBody("direct:index", map, String.class);

Search Example

Searching on specific field(s) and value use the Operation ´Search´. Pass in the query JSON String or the Map

from("direct:search")
  .to("elasticsearch://elasticsearch?operation=Search&indexName=twitter");
<route>
    <from uri="direct:search"/>
    <to uri="elasticsearch://elasticsearch?operation=Search&amp;indexName=twitter"/>
</route>
String query = "{\"query\":{\"match\":{\"content\":\"new release of ApacheCamel\"}}}";
HitsMetadata<?> response = template.requestBody("direct:search", query, HitsMetadata.class);

Search on specific field(s) using Map.

Map<String, Object> actualQuery = new HashMap<>();
actualQuery.put("content", "new release of ApacheCamel");

Map<String, Object> match = new HashMap<>();
match.put("match", actualQuery);

Map<String, Object> query = new HashMap<>();
query.put("query", match);
HitsMetadata<?> response = template.requestBody("direct:search", query, HitsMetadata.class);

Search using Elasticsearch scroll api to fetch all results.

from("direct:search")
  .to("elasticsearch://elasticsearch?operation=Search&indexName=twitter&useScroll=true&scrollKeepAliveMs=30000");
<route>
    <from uri="direct:search"/>
    <to uri="elasticsearch://elasticsearch?operation=Search&amp;indexName=twitter&amp;useScroll=true&amp;scrollKeepAliveMs=30000"/>
</route>
String query = "{\"query\":{\"match\":{\"content\":\"new release of ApacheCamel\"}}}";
try (ElasticsearchScrollRequestIterator response = template.requestBody("direct:search", query, ElasticsearchScrollRequestIterator.class)) {
    // do something smart with results
}

Split EIP can also be used.

from("direct:search")
  .to("elasticsearch://elasticsearch?operation=Search&indexName=twitter&useScroll=true&scrollKeepAliveMs=30000")
  .split()
  .body()
  .streaming()
  .to("mock:output")
  .end();

MultiSearch Example

MultiSearching on specific field(s) and value uses the Operation ´MultiSearch´. Pass in the MultiSearchRequest instance

from("direct:multiSearch")
  .to("elasticsearch://elasticsearch?operation=MultiSearch");
<route>
    <from uri="direct:multiSearch"/>
    <to uri="elasticsearch://elasticsearch?operation=MultiSearch"/>
</route>

MultiSearch on specific field(s)

MsearchRequest.Builder builder = new MsearchRequest.Builder().index("twitter").searches(
        new RequestItem.Builder().header(new MultisearchHeader.Builder().build())
                .body(new MultisearchBody.Builder().query(b -> b.matchAll(x -> x)).build()).build(),
        new RequestItem.Builder().header(new MultisearchHeader.Builder().build())
                .body(new MultisearchBody.Builder().query(b -> b.matchAll(x -> x)).build()).build());
List<MultiSearchResponseItem<?>> response = template.requestBody("direct:multiSearch", builder, List.class);

Document type

For all the search operations, it is possible to indicate the type of document to retrieve to get the result already unmarshalled with the expected type.

The document type can be set using the header "documentClass" or via the uri parameter of the same name.

Using Camel Elasticsearch with Spring Boot

When you use camel-elasticsearch-starter with Spring Boot v2, then you must declare the following dependency in your own pom.xml.

<dependency>
  <groupId>jakarta.json</groupId>
  <artifactId>jakarta.json-api</artifactId>
  <version>2.0.2</version>
</dependency>

This is needed because Spring Boot v2 provides jakarta.json-api:1.1.6, and Elasticsearch requires to use json-api v2.

Use RestClient provided by Spring Boot

By default, Spring Boot will auto configure an Elasticsearch RestClient that will be used by camel, it is possible to customize the client with the following basic properties:

spring.elasticsearch.uris=myelkhost:9200
spring.elasticsearch.username=elkuser
spring.elasticsearch.password=secure!!

More information can be found in https://docs.spring.io/spring-boot/docs/current/reference/html/application-properties.html#application-properties.data.spring.elasticsearch.connection-timeout

Disable Sniffer when using Spring Boot

When Spring Boot is on the classpath, the Sniffer client for Elasticsearch is enabled by default. This option can be disabled in the Spring Boot Configuration:

spring:
  autoconfigure:
    exclude: org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientAutoConfiguration

Spring Boot Auto-Configuration

When using elasticsearch with Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-elasticsearch-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 16 options, which are listed below.

Name Description Default Type

camel.component.elasticsearch.autowired-enabled

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

Boolean

camel.component.elasticsearch.certificate-path

The path of the self-signed certificate to use to access to Elasticsearch.

String

camel.component.elasticsearch.client

To use an existing configured Elasticsearch client, instead of creating a client per endpoint. This allows customizing the client with specific settings. The option is a org.elasticsearch.client.RestClient type.

RestClient

camel.component.elasticsearch.connection-timeout

The time in ms to wait before connection will time out.

30000

Integer

camel.component.elasticsearch.enable-document-only-mode

Indicates whether the body of the message contains only documents. By default, it is set to false to be able to do the same requests as what the Document API supports (see https://www.elastic.co/guide/en/elasticsearch/reference/current/docs.html for more details). To ease the migration of routes based on the legacy component camel-elasticsearch-rest, you should consider enabling the mode, especially if your routes do update operations.

false

Boolean

camel.component.elasticsearch.enable-s-s-l

Enable SSL.

false

Boolean

camel.component.elasticsearch.enable-sniffer

Enable automatically discover nodes from a running Elasticsearch cluster. If this option is used in conjunction with Spring Boot, then it’s managed by the Spring Boot configuration (see: Disable Sniffer in Spring Boot).

false

Boolean

camel.component.elasticsearch.enabled

Whether to enable auto configuration of the elasticsearch component. This is enabled by default.

Boolean

camel.component.elasticsearch.host-addresses

Comma separated list with ip:port formatted remote transport addresses to use. The ip and port options must be left blank for hostAddresses to be considered instead.

String

camel.component.elasticsearch.lazy-start-producer

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

Boolean

camel.component.elasticsearch.max-retry-timeout

The time in ms before retry.

30000

Integer

camel.component.elasticsearch.password

Password for authenticating.

String

camel.component.elasticsearch.sniff-after-failure-delay

The delay of a sniff execution scheduled after a failure (in milliseconds).

60000

Integer

camel.component.elasticsearch.sniffer-interval

The interval between consecutive ordinary sniff executions in milliseconds. Will be honoured when sniffOnFailure is disabled or when there are no failures between consecutive sniff executions.

300000

Integer

camel.component.elasticsearch.socket-timeout

The timeout in ms to wait before the socket will time out.

30000

Integer

camel.component.elasticsearch.user

Basic authenticate user.

String
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