Using hasChildQuery causes empty results with java API

Elastic Stack Elasticsearch
1

I am trying to implement has_child with ES java client. The mapping looks like that:

curl -XPUT 'http://localhost:9200/users/'  -d '
{
    "mappings": {
        "user": {
            "properties": {
                "firstName": {
                    "type": "string",
                    "analyzer": "standard"
                }
            }
        },
        "meta": {
            "_parent": {
                "type": "user"
            },
            "properties": {
                "data": {
                    "type": "string",
                    "analyzer": "standard"
                },
                "business": {
                    "type": "string",
                    "index" : "not_analyzed"
                }
            }
        }
    }
}
'

I can successfully search via REST API with:

curl "http://localhost:9200/users/user/_search" -d '{
    "query": {
        "bool": { 
            "must": [
                {
                    "query_string" : {
                        "fields": ["firstName"],
                        "query": "Cho"
                    }
                },
                {
                    "has_child": {
                        "type": "meta",
                        "query": { 
                            "simple_query_string" : {
                                "query":    "int*",
                                "fields": [ "data" ] 
                              }
                        } 
                    }
                }
            ]
        }
    }
}'

but can't make it work with java client. The code I have:

SearchRequestBuilder requestBuilder = client.prepareSearch("users")
     .setTypes("user", "meta")
     .setQuery(
             boolQuery()
                    .must(queryStringQuery(String.format("%s*", queryString)).field("firstName"))
                    .must(hasChildQuery("meta", simpleQueryStringQuery(String.format("%s*", queryString)).field("data")))
     .setFrom(page)
     .setSize(size);
SearchResponse searchResponse = requestBuilder
     .execute()
     .actionGet();

Both versions (server and client) are 2.1.0. I repeat - the parent/child relations are fine since I can search via REST API. Any thoughts?

2

The structure of the query in the Java api looks ok. I wonder what queryString variable resolve to when you run that Java code. Also the inner query in the has_child query seems different than in the rest example (int* instead of Cho, assuming that Cho is the user's query string)?