如何在 Spring Data ES 3.2.0.M1 中使用高级 Rest 客户端

Spring Data ES 3.2.0.M1 仍然使用旧的TransportClient代替HighLevelRestClient

Spring Data ES 3.2.0.M1 支持高级 Rest 客户端，请参阅添加对 Java 高级 REST 客户端的支持 https://jira.spring.io/browse/DATAES-407。我已将 Spring Data ES 3.2.0.M1 添加到 SB2 应用程序：

        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-elasticsearch</artifactId>
            <version>3.2.0.M1</version>
        </dependency>

然而，仍然TransportClient用来。有两个迹象表明：启动时出现异常：

o.e.transport.netty4.Netty4Transport     : exception caught on transport layer [NettyTcpChannel{localAddress=/127.0.0.1:61171, remoteAddress=localhost/127.0.0.1:8085}], closing connection

io.netty.handler.codec.DecoderException: java.io.StreamCorruptedException: invalid internal transport message format, got (48,54,54,50)
    at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:472) ~[netty-codec-4.1.33.Final.jar:4.1.33.Final]

和调用时的异常堆栈跟踪ElasticsearchTemplate:

    at org.elasticsearch.client.transport.TransportClientNodesService.ensureNodesAreAvailable(TransportClientNodesService.java:349)
    at org.elasticsearch.client.transport.TransportClientNodesService.execute(TransportClientNodesService.java:247)
    at org.elasticsearch.client.transport.TransportProxyClient.execute(TransportProxyClient.java:60)
    at org.elasticsearch.client.transport.TransportClient.doExecute(TransportClient.java:382)
    at org.elasticsearch.client.support.AbstractClient.execute(AbstractClient.java:395)
    at org.elasticsearch.client.support.AbstractClient.execute(AbstractClient.java:384)
    at org.elasticsearch.action.ActionRequestBuilder.execute(ActionRequestBuilder.java:46)
    at org.springframework.data.elasticsearch.core.ElasticsearchTemplate.getSearchResponse(ElasticsearchTemplate.java:947)

是否有任何配置参数告诉 Spring Data ES 切换到新的高级 Rest 客户端？文档对此只字未提。

附： Spring Data ES 3.2.0.M1 有6.4.3ES客户端版本：

Caused by: java.io.StreamCorruptedException: invalid internal transport message format, got (48,54,54,50)
    at org.elasticsearch.transport.TcpTransport.validateMessageHeader(TcpTransport.java:1327) ~[elasticsearch-6.4.3.jar:6.4.3]
    at org.elasticsearch.transport.netty4.Netty4SizeHeaderFrameDecoder.decode(Netty4SizeHeaderFrameDecoder.java:36) ~[transport-netty4-client-6.4.3.jar:6.4.3]
    at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:502) ~[netty-codec-4.1.33.Final.jar:4.1.33.Final]
    at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:441) ~[netty-codec-4.1.33.Final.jar:4.1.33.Final]
    ... 20 common frames omitted

后端运行6.4.2版本：

bash-4.4$ curl http://127.0.0.1:8085
{
  "name" : "NA17WWR",
  "cluster_name" : "494164851665",
  "cluster_uuid" : "7t3LoK7PRp-ur6FyxSmHwQ",
  "version" : {
    "number" : "6.4.2",
    "build_flavor" : "oss",
    "build_type" : "zip",
    "build_hash" : "04711c2",
    "build_date" : "2018-10-16T09:16:35.059415Z",
    "build_snapshot" : false,
    "lucene_version" : "7.4.0",
    "minimum_wire_compatibility_version" : "5.6.0",
    "minimum_index_compatibility_version" : "5.0.0"
  },
  "tagline" : "You Know, for Search"
}

正如您所提到的问题中提到的，高级 REST 客户端可在ElasticsearchRestTemplate https://github.com/spring-projects/spring-data-elasticsearch/blob/master/src/main/java/org/springframework/data/elasticsearch/core/ElasticsearchRestTemplate.java (see PR #216 https://github.com/spring-projects/spring-data-elasticsearch/pull/216）不在ElasticsearchTemplate，出于向后兼容性的原因，他们将保留到 ES 7。

您可以使用以下配置创建一个：

<bean name="elasticsearchTemplate"
      class="org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate">
    <constructor-arg name="client" ref="restClient"/>
</bean>

<elasticsearch:rest-client id="restClient"/>