Http Read timeouts on query calls to Elastic Search cluster - elasticsearch

Question

I'm troubleshooting an issue with our application hosted in K8s pod, which tries to query ES cluster through ES Jest Client. Most of the queries were successful, but randomly a call fails with read timeout. Any help will be appreciated.
Jest Client version:6.3.1
ES cluster is hosted in AWS
Below i'm providing apache http debug logs.
o.a.h.c.protocol.RequestAuthCache - Auth cache not set in the context
o.a.h.i.c.BasicHttpClientConnectionManager - Get connection for route
{}->http://dev-app-elasticsearch-lb.xyz.com:9200
o.a.h.impl.execchain.MainClientExec - Executing request POST
/_search?search_type=dfs_query_then_fetch&preference=_primary_first
HTTP/1.1 o.a.h.impl.execchain.MainClientExec - Target auth state:
UNCHALLENGED o.a.h.impl.execchain.MainClientExec - Proxy auth state:
UNCHALLENGED org.apache.http.headers - http-outgoing-16 >> POST
/_search?search_type=dfs_query_then_fetch&preference=_primary_first
HTTP/1.1 org.apache.http.headers - http-outgoing-16 >>
Content-Length: 2531 org.apache.http.headers - http-outgoing-16 >>
Content-Type: application/json; charset=UTF-8
org.apache.http.headers - http-outgoing-16 >> Host:
dev-app-elasticsearch-lb.xyz.com:9200 org.apache.http.headers -
http-outgoing-16 >> Connection: Keep-Alive org.apache.http.headers -
http-outgoing-16 >> User-Agent: Apache-HttpClient/4.5 (Java/1.8.0_181)
org.apache.http.headers - http-outgoing-16 >> Accept-Encoding:
gzip,deflate org.apache.http.wire - http-outgoing-16 >> "POST
/_search?search_type=dfs_query_then_fetch&preference=_primary_first
HTTP/1.1[\r][\n]" org.apache.http.wire - http-outgoing-16 >>
"Content-Length: 2531[\r][\n]" org.apache.http.wire -
http-outgoing-16 >> "Content-Type: application/json;
charset=UTF-8[\r][\n]" org.apache.http.wire - http-outgoing-16 >>
"Host: dev-app-elasticsearch-lb.xyz.com:9200[\r][\n]"
org.apache.http.wire - http-outgoing-16 >> "Connection:
Keep-Alive[\r][\n]" org.apache.http.wire - http-outgoing-16 >>
"User-Agent: Apache-HttpClient/4.5 (Java/1.8.0_181)[\r][\n]"
org.apache.http.wire - http-outgoing-16 >> "Accept-Encoding:
gzip,deflate[\r][\n]" org.apache.http.wire - http-outgoing-16 >>
"[\r][\n]" org.apache.http.wire - http-outgoing-16 >> "{[\n]"
....<<outgoing query details>>
o.a.h.i.c.PoolingHttpClientConnectionManager - Closing connections
idle longer than 60000 MILLISECONDS
o.a.h.i.c.PoolingHttpClientConnectionManager - Closing connections
idle longer than 60000 MILLISECONDS
o.a.h.i.c.PoolingHttpClientConnectionManager - Closing connections
idle longer than 60000 MILLISECONDS
o.a.h.i.c.PoolingHttpClientConnectionManager - Closing connections
idle longer than 60000 MILLISECONDS
c.t.c.util.concurrent.DatabaseLock - Cleaning up expired locks from DS
0 o.a.h.i.c.BasicHttpClientConnectionManager - Closing connection
o.a.h.i.c.DefaultManagedHttpClientConnection - http-outgoing-6: Close
connection o.a.h.i.n.c.PoolingNHttpClientConnectionManager - Closing
connections idle longer than 15 MINUTES
o.a.h.i.n.c.PoolingNHttpClientConnectionManager - Closing connections
idle longer than 15 MINUTES
o.a.h.i.n.c.PoolingNHttpClientConnectionManager - Closing connections
idle longer than 15 MINUTES```
Any help would be greatly appreciated.
Thanks
Naresh