How to construct QueryBuilder from JSON DSL when using Java API in ElasticSearch?

问题

I'm using ElasticSearch as a search service in Spring Web project which using Transport Client to communicate with ES.

I'm wondering if there exists a method which can construct a QueryBuilder from a JSON DSL. for example, convert this bool query DSL JSON to a QueryBuilder.

{
    "query" : {
        "bool" : {
            "must" : { "match" : {"content" : "quick"},
            "should": { "match": {"content" : "lazy"}
        }
    }
}

I need this method because I have to receive user's bool string input from web front-side, and parse this bool string to a QueryBuilder. However it not suit to use QueryBuilders.boolQuery().must(matchQB).should(shouldQB).must_not(mustNotQB). Because we may need several must or non must query.

If there exist a method can construct a QueryBuilder from JSON DSL or there exists alternative solutions, it will much easier.

PS: I have found two method which can wrap a DSL String to a QueryBuilder for ES search. One is WrapperQueryBuilder, see details here. http://javadoc.kyubu.de/elasticsearch/HEAD/org/elasticsearch/index/query/WrapperQueryBuilder.html Another is QueryBuilders.wrapperQuery(String DSL).

回答1:

You can use QueryBuilders.wrapperQuery(jsonQueryString);

回答2:

You can use setQuery, which can receive a json format string.

/**
 * Constructs a new search source builder with a raw search query.
 */
public SearchRequestBuilder setQuery(String query) {
    sourceBuilder().query(query);
    return this;
}

Note this: only part of the DSL is needed, the {"query": } part is omitted, like this:

SearchResponse searchResponse = client.prepareSearch(indices).setQuery("{\"term\": {\"id\": 1}}").execute().actionGet();

回答3:

It might be worth investigating low level rest client. With this you can do:

RestClient esClient = RestClient.builder(new HttpHost("localhost", 9200, "http")).build();
Request request = new Request("POST", "/INDEX_NAME/_doc/_search");
request.setJsonEntity(yourJsonQueryString);

Response response = esClient.performRequest(request);

String jsonResponse = EntityUtils.toString(response.getEntity());

来源：https://stackoverflow.com/questions/25859921/how-to-construct-querybuilder-from-json-dsl-when-using-java-api-in-elasticsearch

标签

java

json

ElasticSearch

dsl