[FTS] Match queries time-out (with moss turned off)

Build
4.5.0-1875

Testcase
./testrunner -i INI_FILE.ini get-cbcollect-info=False,get-logs=False,stop-on-failure=False,compare_es=True,cluster=D+F,moss=False,GROUP=P0 -t fts.stable_topology_fts.StableTopFTS.test_query_type,items=100000,num_queries=1000,query_types=match,cluster=D,F,F,compare_es=True,GROUP=P0

This a regression between builds 1673 and ____(will confirm).

ES optional. Set compare_es param accordingly.

Please note that the rest timeout for testrunner is currently 60s (log wrongly says 30s)

Testrunner log from 1875 with moss enabled: https://gist.github.com/arunapiravi/de3ed3e69885a73e9195

Testrunner log from 1875 with moss disabled: https://gist.github.com/arunapiravi/e2464a8bf7cf1461eb7d

Testrunner log from 1673 with moss disabled: https://gist.github.com/arunapiravi/194571d57227608c292c

In 1673, I found no query-timeouts for the same testcase. Memory usage was well below 21% and most queries returned results in less than 5 secs.

I do not yet have logs from 1873 or an older build on which I see this problem. Will attach soon.