java结合es实现半边查询

半边查询（Half-Side Query）是指在搜索时只匹配关键词的一部分，通常是前缀或后缀。Java结合ES实现半边查询可以通过使用ES的Prefix Query或Wildcard Query来实现。

Prefix Query是指匹配以指定字符串开头的文档，例如搜索"hello*"可以匹配到"hello world"、"hello kitty"等文档。示例代码如下：

SearchRequest searchRequest = new SearchRequest("index_name");SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
PrefixQueryBuilder prefixQueryBuilder = QueryBuilders.prefixQuery("field_name", "hello");
searchSourceBuilder.query(prefixQueryBuilder);
searchRequest.source(searchSourceBuilder);
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

Wildcard Query是指匹配符合通配符模式的文档，例如搜索"he*o"可以匹配到"hello world"、"hey you"等文档。示例代码如下：

SearchRequest searchRequest = new SearchRequest("index_name");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
WildcardQueryBuilder wildcardQueryBuilder = QueryBuilders.wildcardQuery("field_name", "he*o");
searchSourceBuilder.query(wildcardQueryBuilder);
searchRequest.source(searchSourceBuilder);
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);