Service 'fts' exited with status 2. Restarting

Couchbase Server Enterprise Edition 6.5.0 build 4960

Service 'fts' exited with status 2. Restarting. Messages:
/home/couchbase/jenkins/workspace/couchbase-server-unix/godeps/src/github.com/blevesearch/bleve/search/collector/topn.go:213 +0x35a
github.com/blevesearch/bleve.(*indexImpl).SearchInContext(0xc00051c4d0, 0x1070ba0, 0xc0000be050, 0xc00c1c6f20, 0x0, 0x0, 0x0)
/home/couchbase/jenkins/workspace/couchbase-server-unix/godeps/src/github.com/blevesearch/bleve/index_impl.go:532 +0xe0a
github.com/couchbase/cbft.(*cacheBleveIndex).SearchInContext(0xc012194600, 0x1070ba0, 0xc0000be050, 0xc00c1c6f20, 0x65725f6469636f64, 0x70786567, 0x1945e78)
/home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/cbft/cache_bleve.go:110 +0x37f
github.com/blevesearch/bleve.MultiSearch.func1(0x107b1e0, 0xc012194600, 0xc00c1c6f20)
/home/couchbase/jenkins/workspace/couchbase-server-unix/godeps/src/github.com/blevesearch/bleve/index_alias_impl.go:469 +0xf2
created by github.com/blevesearch/bleve.MultiSearch
/home/couchbase/jenkins/workspace/couchbase-server-unix/godeps/src/github.com/blevesearch/bleve/index_alias_impl.go:476 +0x1e0

Hey @giorgited, would you be able to share a test case that caused this crash on your system?