race condition for retrieving recovery points

Seeing the following panic in CI.

http://ci2i-unstable.northscale.in/gsi-10.09.2019-22.55.fail.html

panic: runtime error: slice bounds out of range

goroutine 117 [running]:
panic(0xf896c0, 0xc420018160)
/home/buildbot/.cbdepscache/exploded/x86_64/go-1.7.6/go/src/runtime/panic.go:500 +0x1a1
github.com/couchbase/indexing/secondary/indexer.(*plasmaSlice).GetSnapshots(0xc426238500, 0x4181b3, 0xc420019158, 0xc423a29ee0, 0x6a2266, 0x1b897f0)
goproj/src/github.com/couchbase/indexing/secondary/indexer/plasma_slice.go:1372 +0xd24
github.com/couchbase/indexing/secondary/indexer.(*plasmaSlice).doRecovery(0xc426238500, 0x62, 0xc423a2a1e0)
goproj/src/github.com/couchbase/indexing/secondary/indexer/plasma_slice.go:429 +0x2f
github.com/couchbase/indexing/secondary/indexer.(*plasmaSlice).initStores(0xc426238500, 0xf34bc0, 0xc42019ee20)
goproj/src/github.com/couchbase/indexing/secondary/indexer/plasma_slice.go:382 +0x2794
github.com/couchbase/indexing/secondary/indexer.newPlasmaSlice(0xc423913d40, 0x5b, 0x0, 0x6a3f58b979ae1950, 0xc423698160, 0x10, 0xc423698170, 0x6, 0xc423698176, 0x7, ...)
goproj/src/github.com/couchbase/indexing/secondary/indexer/plasma_slice.go:212 +0xd72
github.com/couchbase/indexing/secondary/indexer.NewPlasmaSlice(0xc423913d40, 0x5b, 0x0, 0x6a3f58b979ae1950, 0xc423698160, 0x10, 0xc423698170, 0x6, 0xc423698176, 0x7, ...)
goproj/src/github.com/couchbase/indexing/secondary/indexer/plasma_enterprise.go:27 +0xec
github.com/couchbase/indexing/secondary/indexer.NewSlice(0x0, 0xc423a2c7b0, 0xc423a2c480, 0xc420139050, 0xc42009c680, 0x1b27c00, 0xc4222d4a00, 0x0, 0x0)
goproj/src/github.com/couchbase/indexing/secondary/indexer/indexer.go:6879 +0x6ed
github.com/couchbase/indexing/secondary/indexer.(*indexer).initPartnInstance(0xc420078300, 0x5cd2773ec79915df, 0x6a3f58b979ae1950, 0xc423698160, 0x10, 0xc423698170, 0x6, 0xc423698176, 0x7, 0xc42366e360, ...)
goproj/src/github.com/couchbase/indexing/secondary/indexer/indexer.go:3994 +0x324
github.com/couchbase/indexing/secondary/indexer.(*indexer).initFromPersistedState(0xc420078300, 0xc420070000, 0xc42007b0e0)
goproj/src/github.com/couchbase/indexing/secondary/indexer/indexer.go:5661 +0x524
github.com/couchbase/indexing/secondary/indexer.(*indexer).bootstrap1.func1(0xc420078300, 0xc420073aa0, 0x0)
goproj/src/github.com/couchbase/indexing/secondary/indexer/indexer.go:5238 +0x336
created by github.com/couchbase/indexing/secondary/indexer.(*indexer).bootstrap1
goproj/src/github.com/couchbase/indexing/secondary/indexer/indexer.go:5245 +0x474