RestHighLevelClient 实现 分词 模糊 相似度查询

RestHighLevelClient 是 Elasticsearch 官方提供的 Java 客户端，可以通过它来实现分词、模糊、相似度查询。其中，分词查询可以使用 match 查询，模糊查询可以使用 fuzzy 查询，相似度查询可以使用 more_like_this 查询。

例如，使用 match 查询实现分词查询：

SearchRequest searchRequest = new SearchRequest("index");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
MatchQueryBuilder matchQueryBuilder = QueryBuilders.matchQuery("field", "query");
searchSourceBuilder.query(matchQueryBuilder);
searchRequest.source(searchSourceBuilder);
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

使用 fuzzy 查询实现模糊查询：

SearchRequest searchRequest = new SearchRequest("index");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
FuzzyQueryBuilder fuzzyQueryBuilder = QueryBuilders.fuzzyQuery("field", "query");
searchSourceBuilder.query(fuzzyQueryBuilder);
searchRequest.source(searchSourceBuilder);
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

使用 more_like_this 查询实现相似度查询：

SearchRequest searchRequest = new SearchRequest("index");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
MoreLikeThisQueryBuilder moreLikeThisQueryBuilder = QueryBuilders.moreLikeThisQuery(new String[]{"field1", "field2"}, new String[]{"like_text1", "like_text2"}, null);
searchSourceBuilder.query(moreLikeThisQueryBuilder);
searchRequest.source(searchSourceBuilder);
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);