Elasticsearch Rest

Since Camel 2.21

Only producer is supported

The ElasticSearch component allows you to interface with an ElasticSearch 6.x API using the REST 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-rest</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

URI format

elasticsearch-rest://clusterName[?options]

Configuring Options

Camel components are configured on two separate levels:

  • component level

  • endpoint level

Configuring Component Options

The component level is the highest level which holds general and common configurations that are inherited by the endpoints. 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.

Configuring components can be done with the Component DSL, in a configuration file (application.properties|yaml), or directly with Java code.

Configuring Endpoint Options

Where you find yourself configuring the most is on endpoints, as endpoints often have many options, which allows you to configure what you need the endpoint to do. The options are also categorized into whether the endpoint is used as consumer (from) or as a producer (to), or used for both.

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

A good practice when configuring options is to use Property Placeholders, which allows to not hardcode urls, port numbers, sensitive information, and other settings. In other words placeholders allows to externalize the configuration from your code, and gives more flexibility and reuse.

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

Component Options

The Elasticsearch Rest component supports 13 options, which are listed below.

Name Description Default Type

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.

boolean

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.

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

connectionTimeout (advanced)

The time in ms to wait before connection will timeout.

int

enableSniffer (advanced)

Enable automatically discover nodes from a running Elasticsearch cluster.

Boolean

hostAddresses (advanced)

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

maxRetryTimeout (advanced)

The time in ms before retry.

int

sniffAfterFailureDelay (advanced)

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

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.

int

socketTimeout (advanced)

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

int

enableSSL (security)

Enable SSL.

Boolean

password (security)

Password for authenticate.

String

user (security)

Basic authenticate user.

String

Endpoint Options

The Elasticsearch Rest endpoint is configured using URI syntax:

elasticsearch-rest: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 (17 parameters)

Name Description Default Type

connectionTimeout (producer)

The time in ms to wait before connection will timeout.

int

disconnect (producer)

Disconnect after it finish calling the producer.

boolean

enableSniffer (producer)

Enable automatically discover nodes from a running Elasticsearch cluster.

boolean

enableSSL (producer)

Enable SSL.

boolean

from (producer)

Starting index of the response.

Integer

hostAddresses (producer)

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

String

indexName (producer)

The name of the index to act against.

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.

boolean

maxRetryTimeout (producer)

The time in ms before retry.

int

operation (producer)

What operation to perform.

Enum values:

  • Index

  • Update

  • Bulk

  • BulkIndex

  • GetById

  • MultiGet

  • MultiSearch

  • Delete

  • DeleteIndex

  • Search

  • Exists

  • Ping

ElasticsearchOperation

scrollKeepAliveMs (producer)

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

int

size (producer)

Size of the response.

Integer

sniffAfterFailureDelay (producer)

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

int

snifferInterval (producer)

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.

int

socketTimeout (producer)

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

int

useScroll (producer)

Enable scroll usage.

boolean

waitForActiveShards (producer)

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

int

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[], XContentBuilder or IndexRequest content to index

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

GetById

String or GetRequest index id of content to retrieve

Retrieves the specified index and returns a GetResult object in the body

Delete

String or DeleteRequest index name and type of content to delete

Deletes the specified indexName and indexType and returns a DeleteResponse object in the body

DeleteIndex

String or DeleteRequest index name of the index to delete

Deletes the specified indexName and returns a status code the body

BulkIndex

a List, BulkRequest, or Collection of any type that is already accepted (XContentBuilder, Map, byte[], String)

Adds content to an index and return a List of the id of the successfully indexed documents in the body

Bulk

a List, BulkRequest, or Collection of any type that is already accepted (XContentBuilder, Map, byte[], String)

Adds content to an index and returns the BulkItemResponse[] object in the body

Search

Map, String or SearchRequest

Search the content with the map of query string

MultiSearch

MultiSearchRequest

Multiple search in one

Exists

Index name(indexName) as header

Checks the index exists or not and returns a Boolean flag in the body

Update

Map, UpdateRequest, String, byte[] or XContentBuilder content to update

Updates content to an index and returns the content’s indexId in the body.

Ping

None

Pings the remote 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-rest", 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);

camelContext.addComponent("elasticsearch-rest", elasticsearchComponent);

Index Example

Below is a simple INDEX example

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

For this operation you’ll 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);

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

Search using Elasticsearch scroll api in order to fetch all results.

from("direct:search")
  .to("elasticsearch-rest://elasticsearch?operation=Search&indexName=twitter&useScroll=true&scrollKeepAliveMs=30000");
<route>
    <from uri="direct:search"/>
    <to uri="elasticsearch-rest://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-rest://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 use the Operation ´MultiSearch´. Pass in the MultiSearchRequest instance

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

MultiSearch on specific field(s)

SearchRequest req = new SearchRequest();
req.indices("twitter");
SearchRequest req1 = new SearchRequest();
req.indices("twitter");
MultiSearchRequest request = new MultiSearchRequest().add(req1).add(req);
Item[] response = template.requestBody("direct:search", request, Item[].class);

Spring Boot Auto-Configuration

When using elasticsearch-rest 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-rest-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 14 options, which are listed below.

Name Description Default Type

camel.component.elasticsearch-rest.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-rest.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-rest.connection-timeout

The time in ms to wait before connection will timeout.

30000

Integer

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

Enable SSL.

false

Boolean

camel.component.elasticsearch-rest.enable-sniffer

Enable automatically discover nodes from a running Elasticsearch cluster.

false

Boolean

camel.component.elasticsearch-rest.enabled

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

Boolean

camel.component.elasticsearch-rest.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-rest.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-rest.max-retry-timeout

The time in ms before retry.

30000

Integer

camel.component.elasticsearch-rest.password

Password for authenticate.

String

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

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

60000

Integer

camel.component.elasticsearch-rest.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-rest.socket-timeout

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

30000

Integer

camel.component.elasticsearch-rest.user

Basic authenticate user.

String