记第一次java连elasticsearch出现的问题

public class Elasticseach {

TransportClient client = null ;

public Elasticseach(){

//根据官方文档得知，如果集群名称改变，则在设置中设成配置文件里上设置的名字

Settings settings = Settings. builder ()

.put( "cluster.name" , "cluemining_es_cluester" ).build();

//在linux 中elasticsearch/bin/config/elasticseach.yml 中设置集群名称

try {

//我用的是5.5.2版本，该版本与最新的6系列连接方式不同

client = new PreBuiltTransportClient(Settings. EMPTY )

.addTransportAddress( new InetSocketTransportAddress(InetAddress. getByName ( "10.0.0.42" ), 9900 ))

.addTransportAddress( new InetSocketTransportAddress(InetAddress. getByName ( "10.0.0.42" ), 9901 ))

.addTransportAddress( new InetSocketTransportAddress(InetAddress. getByName ( "10.0.0.42" ), 9902 ));

SearchResponse response = client .prepareSearch().get();

System. out .println(response);

} catch (UnknownHostException e) {

e.printStackTrace();

} finally {

client .close();

}

}

public TransportClient getConnection(){

if ( client == null ) {

synchronized (Elasticseach. class ) {

if ( client == null ) {

new Elasticseach();

}

}

}

return client ;

}

}

注：mavan导elasticsearch时可能会出现依赖冲突，既 org.elasticsearch.client

包中的netty4可能因版本问题出现java.lang.AbstractMethodError: org.elasticsearch.transport.TcpTransport.sendMessage问题

解决方法：将netty版本改成elasticsearch跟包一致，如下所示

< dependency >

< groupId > org.elasticsearch.client groupId >

< artifactId > transport artifactId >

< version > 5.5.2 version >

< exclusions >

< exclusion >

< artifactId > transport-netty4-client artifactId >

< groupId > org.elasticsearch.plugin groupId >

exclusion >

< exclusion >

< artifactId > elasticsearch artifactId >

< groupId > org.elasticsearch groupId >

exclusion >

exclusions >

dependency >

< dependency >

< groupId > org.elasticsearch.plugin groupId >

< artifactId > transport-netty4-client artifactId >

< version > 5.5.2 version >

dependency >