通过Java API进行Elasticsearch查询

Question

I am using the following elasticsearch query to fetch the details,

{
    "query": {
        "bool": {
            "must": {
                "match_all": {}
            },
            "filter": {
                "bool": {
                    "should": [
                    {"match": {
                        "val": "GET"
                    }}]
                }
            }
        }
    }
}

It is working fine and given the result as required.

I want to execute the same query through java and get the same results and tried the following,

 getClient().prepareSearch(esIndex)
                .setQuery(QueryBuilders.queryStringQuery(QUERY)).execute().actionGet();

It is not returning the data and throw some query format wrong exception as well.

Is there any Java API available using which the same query can be executed?

NOTE : There is a possibility available to create the boolquery and aggregation builders in java api and execute the same. I am just curious to find a way to execute this query directly through elasticsearch java api

Answer 1

If you really want to use the Query String Query, your query has to follow Query String Syntax :

getClient().prepareSearch(esIndex)
           .setQuery(QueryBuilders.queryStringQuery("val: \"GET\""))
           .execute()
           .actionGet();

As already stated, you should construct your query by using the provided QueryBuilders instead of strings. This will keep your code clean and readable even for complex queries.

getClient().prepareSearch(esIndex)
           .setQuery(QueryBuilders.boolQuery()
                                  .should(QueryBuilders.matchQuery("val", "GET"))
           .execute()
           .actionGet();

Answer 2

BoolQueryBuilder bool       =   boolQuery();

bool.must(QueryBuilders.matchAllQuery()); 
    bool.filter(QueryBuilders.boolQuery().should(QueryBuilders.matchQuery("Val", "GET")));

    AggregationBuilder agg = AggregationBuilders.terms("").field("");

    SearchResponse reponse =    getClient().prepareSearch().setIndices("indexName").setTypes("indexType")
                .setQuery(bool).addAggregation(agg).execute().actionGet();

Answer 3

you should use boolQuery() when you construct your QueryBuilder:

QueryBuilder qb = boolQuery()
            .must(termQuery("content", "test1"))
            .must(termQuery("content", "test4"))
            .mustNot(termQuery("content", "test2"))
            .should(termQuery("content", "test3"))
            .filter(termQuery("content", "test5"));

Official docs: https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/java-compound-queries.html