What do you mean "lines of events"?
If you mean you have 10 sources of events that you are sending to the Indexers, once they arrive to one of them (say IndexerA), then they will never be in IndexerB if you change the outputs.conf after the events have been indexed in IndexerA.
So if you were sending 4 sources to IndexerA, then added 6 sources to IndexerB and later changed the outputs.conf to target the 6 sources to IndexerA, then the events that were indexed between your outputs.conf changes will reside on IndexerB only.
After you changed the outputs.conf to send the 6 sources to IndexerA, all the 10 sources will be on IndexerA, except for that period of time where you were sending to IndexerB.
Let me know if this clarified your question.
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