A task that is sent to all local partitions in order to add the indexes that have been specified in the task.
Each task is executed for a separate partition.
It is a compatibility mode between 3.9 and 3.10 nodes. It is only necessary due to race between
PostJoinMapOperations and MapReplicationOperations, so the map data may arrive before the index definitions.
This task is responsible to put the index instances back in sync with the definitions.