Object Array search support in Elasticsearch - elasticsearch

Question

I have a array of object in elastic search.
I would like to search if a particular field value appears in top 2 position of the array without using script.
Imagine my ES data is as follows
[
{
"_id": "TestID1",
"data": [
{
"name": "Test1",
"priority": 2
},
{
"name": "Test2",
"priority": 3
},
{
"name": "Test3",
"priority": 4
}
]
},
{
"_id": "TestID2",
"data": [
{
"name": "Test3",
"priority": 2
},
{
"name": "Test9",
"priority": 3
},
{
"name": "Test5",
"priority": 4
},
{
"name": "Test10",
"priority": 5
}
]
},
{
"_id": "TestID3",
"data": [
{
"name": "Test1",
"priority": 2
},
{
"name": "Test2",
"priority": 3
},
{
"name": "Test3",
"priority": 6
}
]
}
]
Here I would like to make a query which searches for _Test3_ ONLY within the top 2 elements of the data array.
Searching here would return the result
_id: TestID2's data
because only TestID2 has Test3 in the top 2 of the data array.

Answer 1

You will not be able to perform such request directly without using script. The only solution that I can think of is to create a copy of the array field containing only the first 2 elements. You will then be able to search on this field.
You can add an ingest pipeline to trim your array automatically.
PUT /_ingest/pipeline/top2_elements
{
"description": "Create a top2 field containing only the first two values of an array",
"processors": [
{
"script": {
"source": "ctx.top2 = [ctx.data[0], ctx.data[1]]"
}
}
]
}