Elasticsearch / Opensearch - intersection of common values in arrays - arrays

Question

given
a = [1,2,3,4]
and
b = [1,3]
c = [5,6]
d = [1,6]
how can i find the exact number of common values of a with b,c,d in elasticsearch?
I would expect:
b -> 2
c -> 0
d -> 1

Answer 1

Let consider below is your elasticsearch document,
{
"b": [1,3],
"c": [5,6],
"d": [1,6]
}
Your Elasticsearch Query will looks like below:
Here, You need to use first terms aggregation and above that you need to apply sum_bucket aggregation.
{
"size": 0,
"aggs": {
"b_count": {
"terms": {
"field": "b",
"size": 10,
"include": [1,2,3,4]
}
},
"c_count": {
"terms": {
"field": "c",
"size": 10,
"include": [1,2,3,4]
}
},
"d_count": {
"terms": {
"field": "d",
"size": 10,
"include": [1,2,3,4]
}
},
"b_sum": {
"sum_bucket": {
"buckets_path": "b_count>_count"
}
},
"c_sum": {
"sum_bucket": {
"buckets_path": "c_count>_count"
}
},
"d_sum": {
"sum_bucket": {
"buckets_path": "d_count>_count"
}
}
}
}
Sample Response:
You can use value of b_sum, c_sum and d_sum from below response.
"aggregations" : {
"b_count" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [
{
"key" : 1,
"doc_count" : 1
},
{
"key" : 3,
"doc_count" : 1
}
]
},
"d_count" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [
{
"key" : 1,
"doc_count" : 1
}
]
},
"c_count" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [ ]
},
"b_sum" : {
"value" : 2.0
},
"c_sum" : {
"value" : 0.0
},
"d_sum" : {
"value" : 1.0
}
}