java以RestHighLevelClient方式连接elas

1.编辑pom.xml

<dependency>
        <groupId>org.elasticsearch.client</groupId>
        <artifactId>elasticsearch-rest-high-level-client</artifactId>
        <version>5.6.3</version>
</dependency>
<dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-core</artifactId>
        <version>2.9.1</version>
</dependency>

2.添加log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn">
            <Appenders>
                        <Console name="Console" target="SYSTEM_OUT">
                                    <PatternLayout pattern="%m%n" />
                        </Console>
            </Appenders>
            <Loggers>
                        <Root level="INFO">
                                    <AppenderRef ref="Console" />
                        </Root>
            </Loggers>
</Configuration>

3.测试代码

RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(new HttpHost("127.0.0.1", 9200, "http")).build());
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.matchAllQuery());
searchSourceBuilder.aggregation(AggregationBuilders.terms("top_10_states").field("state").size(10));
SearchRequest searchRequest = new SearchRequest();
searchRequest.indices("social-*");
searchRequest.source(searchSourceBuilder);
SearchResponse searchResponse = client.search(searchRequest);
System.out.println(searchResponse.getHits());