How can I make a SearchRequest in ES 6.0 from a json string using High level REST Client in Scala - elasticsearch

Question

I'm migrating from ES 1.7 to 6.0 and I'm trying to figure out a way to perform a search request passing a plain query to the High Level REST Java client. To keep queries easy to read (and maintain), we want to use a Json string instead of building them with the SearchSourceBuilder. This was possible before but I'm not finding a nice way to do it now.
Example query:
{
"filter": {
"bool": {
"must": [
{
"term": {
"status": "Success"
}
},
{
"term": {
"type": "someType"
}
},
{
"range": {
"endDateTime": {
"lte": "someDateTime"
}
}
}
]
}
}
}
Example code:
val searchRequest = buildSearchRequest(indexName, indexType, query)
val searchResponse = restHighLevelClient.search(searchRequest)
I know it's possible to send the query using the LowLevelClient but it returns a Response and not a SearchResponse. Has anyone faced this issue before? Any workaround or solution?

Answer 1

I'm a little bit late, but I have a close solution for your problem.
Firstly, you need to build your query with something like this:
private QueryBuilder buildQuery(MyObject object) {
BoolQueryBuilder queryBuilder = QueryBuilders.boolQuery();
QueryBuilder statusTerm = QueryBuilders.termQuery("status", object.getStatus());
QueryBuilder typeTerm = QueryBuilders.termQuery("type", object.getType());
QueryBuilder boolQuery = QueryBuilders.boolQuery()
.must(statusTerm)
.must(typeTerm);
queryBuilder.should(boolQuery);
return queryBuilder;
}
Then, you can perform your search and return SearchResponse:
private SearchResponse search(QueryBuilder query) throws IOException {
SearchRequest request = new SearchRequest(elasticSearchClient.getElasticsearchClientProperties().getIndices());
SearchSourceBuilder searchRequestBuilder = request.source();
searchRequestBuilder.query(query);
//SearchSourcebuilder allows you to set your query into your request
return this.elasticSearchClient.search(request);
}
Finally, can have a method that calls both:
public void processSearch(MyObject object) {
QueryBuilder query = buildQuery(object);
SearchResponse response = search(query);
List<FoundObjects> objects = parseResponse(response);
}
I hope this could help. Good luck!