Hi @Manoranjan_Bhol ,
Thanks for your reply.
Please note that, in index definition If you have created _id with type: objectId then in the equals you can not have more than 1 objectId as that accept either only single objectId in the query.
Further, I have noticed you are mentioning 2 index in the query, that create ambiguity, Do you mind sharing the index definition of this string index.
Thanks,
Darshan