A non-clustered Splunk environment has three indexers (A,B,C) and two search heads (X, Y).

Update the user in Splunk web informing them that the results of their search may be incomplete.

Repeat the search request on indexer B without informing the user.

Update the user in Splunk web that their results may be incomple and that Splunk will try to re-execute the search.

Inform the user in Splunk web that their results may be incomplete and have them attempt the search from search head Y.