Elastic Query for single field on multiple values

Hi,
I am not able to come up with a solution how to implement this query. So if someone could help that will be great.

My doc looks something like this

{ a: "val", b: "val1", c: "val3" }

I want to get the results based on my field a. it can have multiple values like 1,2,3,4.....and so on.
So for each possible value when querying i need to promise miminimum result set. Can someone guide on this? Let me know if more input is required in problem clarification.

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