Elastic Search query to find documents where nested field "contains" X objects - database

Question

This is an example of what my data looks like for an Elastic Search index called video_service_inventory:
{
'video_service': 'netflix',
'movies' : [
{'title': 'Mission Impossible', 'genre: 'action'},
{'title': 'The Hangover', 'genre': 'comedy'},
{'title': 'Zoolander', 'genre': 'comedy'},
{'title': 'The Ring', 'genre': 'horror'}
]
}
I have established in my index that the "movies" field is of type "nested"
I want to write a query that says "get me all video_services that contain both of these movies":
{'title': 'Mission Impossible', 'genre: 'action'}
AND
{'title': 'The Ring', 'genre': 'horror'}
where, the title and genre must match. If one movie exists, but not the other, I don't want the query to return that video service.
Ideally, I would like to do this in 1 query. So far, I haven't been able to find a solution.
Anyone have suggestions for writing this search query?

Answer 1

the syntax may vary depending on elasticsearch version, but in general you should combine multiple nested queries within a bool - must query. For nested queries you need to specify path to "navigate" to the nested documents, and you need to qualify the properties with the part + the field name:
{
"query": {
"bool": {
"must": [
{
"nested": {
"path": "movies",
"query": {
"bool": {
"must": [
{ "terms": { "movies.title": "Mission Impossible" } },
{ "terms": { "movies.genre": "action" } }
]
}
}
}
},
{
"nested": {
"path": "movies",
"query": {
"bool": {
"must": [
{ "terms": { "movies.title": "The Ring" } },
{ "terms": { "movies.genre": "horror" } }
]
}
}
}
}
]
}
}
}
This example assumes that the title and genre fields are not analyzed properties. In newer versions of elasticsearch you may find them as a .keyword field, and you would then use "movies.genre.keyword" to query on the not analyzed version of the data.¨
For details on bool queries you can have a look at the documentation on the ES website:
https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-bool-query.html
For nested queries:
https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-nested-query.html