How to close RestHighLevelClient 5.6.X

Question

Below are the maven version we are using

 <dependency>
        <groupId>org.elasticsearch.client</groupId>
        <artifactId>elasticsearch-rest-high-level-client</artifactId>
        <version>5.6.13</version>
  </dependency>


    <dependency>
        <groupId>org.elasticsearch</groupId>
        <artifactId>elasticsearch</artifactId>
        <version>5.6.13</version>
    </dependency>



 private RestHighLevelClient buildRestClient(ElasticRequestVO elasticRequestVO) {
    String elasticHost =
            StringUtils.isNotEmpty(elasticRequestVO.getElasticHost()) ? elasticRequestVO.getElasticHost()
                    : elasticSearchHost;
    int elasticPort =
            (elasticRequestVO.getElasticPort() != 0) ? elasticRequestVO.getElasticPort() : elasticSearchPort;
    String elasticUser =
            StringUtils.isNotEmpty(elasticRequestVO.getElasticUser()) ? elasticRequestVO.getElasticUser()
                    : elasticSearchUser;
    String elasticPassword =
            StringUtils.isNotEmpty(elasticRequestVO.getElasticPassword()) ? elasticRequestVO.getElasticPassword()
                    : elasticSearchPassword;
    HttpHost host = new HttpHost(elasticHost, elasticPort);
    RestClientBuilder restClientBuilder = RestClient.builder(host);

    Optional<String> encodedAuth = getAuthenticationHeader(elasticUser, elasticPassword);

    if (encodedAuth.isPresent()) {
        Header[] requestHeaders =
                new Header[] {new BasicHeader(org.apache.http.HttpHeaders.AUTHORIZATION, encodedAuth.get())};
        restClientBuilder.setDefaultHeaders(requestHeaders);
    }
    return new RestHighLevelClient(restClientBuilder.build());
}

How to close RestHighLevelClient?

RestClientBuilder not Closeable in old version : https://artifacts.elastic.co/javadoc/org/elasticsearch/client/elasticsearch-rest-high-level-client/5.6.0/org/elasticsearch/client/RestHighLevelClient.html — Thierry, Sep 07 '20 at 16:28

xxxception · Answer 1 · 2019-10-31T19:22:06.173

1

If you will see how closing is implemented in one of the latest versions, e.g. 6.2.4 you will found that the RestHighLevelClient just releases the RestClient.
So for closing I can offer you just invoke the restHighLevelClient.getLowLevelClient() and close the rest client lowLevelRestClient.close().

P.S. If just look at the source code would notice that this is just a wrapper over the rest client.

edited Oct 31 '19 at 19:22

answered Oct 31 '19 at 19:16

xxxception

915
10
6

No getLowLevelClient for old version : https://artifacts.elastic.co/javadoc/org/elasticsearch/client/elasticsearch-rest-high-level-client/5.6.0/org/elasticsearch/client/RestHighLevelClient.html – Thierry Sep 07 '20 at 16:30

score 1 · Accepted Answer · answered Nov 06 '19 at 12:12

Insted of returning RestHighLevelClient, retun RestClient from buildRestClient()

Here if code sample

private RestClient buildRestClient(ElasticRequestVO elasticRequestVO) {
    String elasticHost =
            StringUtils.isNotEmpty(elasticRequestVO.getElasticHost()) ? elasticRequestVO.getElasticHost()
                    : elasticSearchHost;
    int elasticPort =
            (elasticRequestVO.getElasticPort() != 0) ? elasticRequestVO.getElasticPort() : elasticSearchPort;
    String elasticUser =
            StringUtils.isNotEmpty(elasticRequestVO.getElasticUser()) ? elasticRequestVO.getElasticUser()
                    : elasticSearchUser;
    String elasticPassword =
            StringUtils.isNotEmpty(elasticRequestVO.getElasticPassword()) ? elasticRequestVO.getElasticPassword()
                    : elasticSearchPassword;
    HttpHost host = new HttpHost(elasticHost, elasticPort);
    RestClientBuilder restClientBuilder = RestClient.builder(host);

    Optional<String> encodedAuth = getAuthenticationHeader(elasticUser, elasticPassword);

    if (encodedAuth.isPresent()) {
        Header[] requestHeaders =
                new Header[] {new BasicHeader(org.apache.http.HttpHeaders.AUTHORIZATION, encodedAuth.get())};
        restClientBuilder.setDefaultHeaders(requestHeaders);
    }
    return restClientBuilder.build();
}

score 0 · Answer 3 · answered Feb 28 '20 at 15:37

The version of my RestHighLevelClient is 5.6.3,and I can't find method like restHighLevelClient.getLowLevelClient() or restHighLevelClient.close(),so I use reflection to get the restClient to close

Field restClientField = RestHighLevelClient.class.getDeclaredField("client");
restClientField.setAccessible(true);
RestClient restclient = (RestClient)restClientField.get(restHighLevelClient);
restClient.close();

Thierry · Answer 4 · 2020-09-07T16:31:14.037

I have the same problem. To close the connexion you must change your method :

private RestClient buildRestClient(ElasticRequestVO elasticRequestVO) {
    String elasticHost =
            StringUtils.isNotEmpty(elasticRequestVO.getElasticHost()) ? elasticRequestVO.getElasticHost()
                    : elasticSearchHost;
    int elasticPort =
            (elasticRequestVO.getElasticPort() != 0) ? elasticRequestVO.getElasticPort() : elasticSearchPort;
    String elasticUser =
            StringUtils.isNotEmpty(elasticRequestVO.getElasticUser()) ? elasticRequestVO.getElasticUser()
                    : elasticSearchUser;
    String elasticPassword =
            StringUtils.isNotEmpty(elasticRequestVO.getElasticPassword()) ? elasticRequestVO.getElasticPassword()
                    : elasticSearchPassword;
    HttpHost host = new HttpHost(elasticHost, elasticPort);
    RestClientBuilder restClientBuilder = RestClient.builder(host);

    Optional<String> encodedAuth = getAuthenticationHeader(elasticUser, elasticPassword);

    if (encodedAuth.isPresent()) {
        Header[] requestHeaders =
                new Header[] {new BasicHeader(org.apache.http.HttpHeaders.AUTHORIZATION, encodedAuth.get())};
        restClientBuilder.setDefaultHeaders(requestHeaders);
    }
    return restClientBuilder.build();
}

Then, when you call your method you can work with

final RestClient restClient=buildRestClient(...);

and do

new RestHighLevelClient(restClient)

when needed. At the end, you close.

Exemple

try (final RestClient restClient=buildRestClient(...)) {
final RestHighLevelClient restHLClient = new RestHighLevelClient(restClient);
// what you want
}

How to close RestHighLevelClient 5.6.X

4 Answers4