Query Elasticsearch to get count of Keywords within matched Keywords

Elastic Stack Elasticsearch
1

Data:

Doc 1:
       field_a : ["A", "B", 'C", "D", "E"]

Doc 2:
       field_a : ["A", "D", "G", "Z", "Y"]

Doc 3:
       field_a : ["F", "W", 'C"]

Doc 4:
       field_a : ["A", "B", 'C", "D", "E", "Z", "Y"]

Doc 5:
       field_a : ["A", "B", "C"]

PS: field_a is of Keyword type.

Query:

terms: ["A", "B", "C", "D", "E"]

Required Response:

Doc 1: 5
Doc 2: 2
Doc 3: 1
Doc 4: 5
Doc 5: 3

Require the required response. It will be perfect if there is any way to generate Custom Score Function to get the same.

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