Elasticsearch [6.8] small index query response time in seconds

Hi folks,
Facing an issue involving a small index of the size 378kb taking around 10s for a read query. We had tried increasing the number of replicas assuming it would help with reads but did not see any noticeable difference.

green open  external_achievements                   RkG3e5uRS_qrgv3_3pDEDg  5  1         71          3    775kb  378.1kb

The following is the query which is being run -


Can someone help in understanding what could cause this query on a very small index to take more then 10s. We have also tried moving the index to a separate rack of 3 nodes & still the query took the same time.

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