Query issue with parent-children relation in Elasticsearch - elasticsearch

Question

Having the following children-father mapping:
curl -XPUT 'localhost:9200/my_index' -d '{
"mappings": {
"my_parent": {
"dynamic": "strict",
"properties" : {
"title" : { "type": "string" },
"body" : { "type": "string" },
"source_id" : { "type": "integer" },
}
},
"my_child": {
"_parent": {"type": "my_parent" },
"properties" : {
"user_id" : { "type": "string" },
}}}}'
... this two parents with ids 10 and 11:
curl -X PUT 'localhost:9200/my_index/my_parent/10' -d '{
"title" : "Microsiervos - Discos duros de 10TB",
"body" : "Empiezan a sacar DD de 30GB en el mercado",
"source_id" : "27",
}'
curl -X PUT 'localhost:9200/my_index/my_parent/11' -d '{
"title" : "Microsiervos - En el 69 llegamos a la luna",
"body" : "Se cumplen 3123 anos de la llegada a la luna",
"source_id" : "27",
}'
... and this two childrens:
curl -XPUT 'localhost:9200/my_index/my_child/1234_10?parent=10' -d '{
"user_id": "1234",
}'
curl -XPUT 'localhost:9200/my_index/my_child/1234_11?parent=11' -d '{
"user_id": "1234",
}'
With the following query, I want to get the _id of the father with user_id = 1234.
curl -XGET 'localhost:9200/my_index/my_parent/_search?pretty=true' -d '{
"_source" : "_id",
"query": {
"has_child": {
"type": "my_child",
"query" : {
"query_string" : {
"default_field" : "user_id",
"query" : "1234"
}}}}}'
This outputs the two ids, 10 and 11.
Now I want to search on parent on those specific ids only, something like this:
curl -XGET 'localhost:9200/my_index/my_parent/_search?pretty=true' -d '{
"query": {
"bool": {
"must": [
{
"terms": {
"_id": ["10", "11"]
}},
{
"query_string": {
"default_field": "body",
"query": "mercado"
}}]}}}'
As you can notice, the "_id": ["10", "11"] part is written by hand. I would like to know if there's a way to combine this two queries in one single query putting the ids returned in the first query automatically on the second query.
So the output to this should be:
},
"hits" : {
"total" : 1,
"max_score" : 0.69177496,
"hits" : [ {
"_index" : "my_index",
"_type" : "my_parent",
"_id" : "10",
"_score" : 0.69177496,
"_source":{
"title" : "Microsiervos - Discos duros de 10TB",
"body" : "Empiezan a sacar DD de 30GB en el mercado",
"source_id" : "27"
}}]}}

Answer 1

Use bool Query and put both conditions in must:
curl -XGET "http://localhost:9200/my_index/my_parent/_search" -d'
{
"query": {
"bool": {
"must": [
{
"query_string": {
"default_field": "body",
"query": "mercado"
}
},
{
"has_child": {
"type": "my_child",
"query": {
"query_string": {
"default_field": "user_id",
"query": "1234"
}
}
}
}
]
}
}
}'