MB-15679 Treat InvalidBucket on DelInstances as success
MB-15679 Treat InvalidBucket on DelInstances as success

In case bucket get deleted/flushed, projector will return InvalidBucket

Change-Id: I94752f01f421c1db3fdc14f6e9f6853352ecca0e

jchris/indexing,jchris/indexing,jchris/indexing,jchris/indexing