Chapter 29. Elasticsearch

29.1. Dependencies

When using elasticsearch with Red Hat build of Camel 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>
</dependency>

29.2. URI format

elasticsearch://clusterName[?options]

29.3. Configuring Options

Camel components are configured on two levels:

Component level
Endpoint level

29.3.1. Component Level Options

The component level is the highest level. The configurations you define at this level are inherited by all the endpoints. For example, a component can have security settings, credentials for authentication, urls for network connection, and so on.

Since components typically have pre-configured defaults for the most common cases, you may need to only configure a few component options, or maybe none at all.

You can configure components with Component DSL in a configuration file (application.properties|yaml), or directly with Java code.

29.3.2. Endpoint Level Options

At the Endpoint level you have many options, which you can use to configure what you want the endpoint to do. The options are categorized according to whether the endpoint is used as a consumer (from) or as a producer (to) or used for both.

You can configure endpoints directly in the endpoint URI as path and query parameters. You can also use Endpoint DSL and DataFormat DSL as type safe ways of configuring endpoints and data formats in Java.

When configuring options, use Property Placeholders for urls, port numbers, sensitive information, and other settings.

Placeholders allows you to externalize the configuration from your code, giving you more flexible and reusable code.

29.4. Component Options

The Elasticsearch component supports 14 options, which are listed below.

Name	Description	Default	Type
connectionTimeout (producer)	The time in ms to wait before connection will timeout.	30000	int
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 timeout.	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 allow to customize 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 authenticate.		String
user (security)	Basic authenticate user.		String

29.5. Endpoint Options

The Elasticsearch endpoint is configured using URI syntax:

elasticsearch:clusterName

with the following path and query parameters:

29.5.1. Path Parameters (1 parameters)

Name	Description	Default	Type
clusterName (producer)	Required Name of the cluster.		String

29.5.2. Query Parameters (19 parameters)

Name	Description	Default	Type
connectionTimeout (producer)	The time in ms to wait before connection will timeout.	30000	int
disconnect (producer)	Disconnect after it finish calling the producer.	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 timeout.	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 path of the self-signed certificate to use to access to Elasticsearch.		String
enableSSL (security)	Enable SSL.	false	boolean

29.6. Message Headers

The Elasticsearch component supports 9 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

29.7. Message Operations

The following ElasticSearch operations are currently supported. Simply 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	Checks 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".
Ping	None	Pings the Elasticsearch cluster and returns true if the ping succeeded, false otherwise

29.8. 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);

29.9. 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 need to specify a 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);

29.10. 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\":{\"doc.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("doc.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 in order 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\":{\"doc.content\":\"new release of ApacheCamel\"}}}";
try (ElasticsearchScrollRequestIterator response = template.requestBody("direct:search", query, ElasticsearchScrollRequestIterator.class)) {
    // do something smart with results
}

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();

29.11. MultiSearch Example

MultiSearching on specific field(s) and value use 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);

29.12. Document type

For all the search operations, it is possible to indicate the type of document to retrieve in order 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.

29.13. 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.

29.13.1. 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 application-properties.data.spring.elasticsearch.connection-timeout.

29.13.2. 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

29.14. Spring Boot Auto-Configuration

The component supports 15 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 allow to customize 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 timeout.	30000	Integer
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 authenticate.		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 timeout.	30000	Integer
camel.component.elasticsearch.user	Basic authenticate user.		String

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