If you have implemented a system with master and backup servers and a master server breaks down, the backup server becomes active automatically. When the master server becomes available again, the system swaps back to the master server.
If you create an index while the master server is unavailable, TREX proceeds as follows:
The TREX admin tool displays this in the Index Landscape area as follows:
TREX does not change this assignment, even when the master server becomes available again. You have to correct the assignment for this index as follows:
The index now has a backup server, and the master and backup servers are assigned to the index correctly.