I have a bunch of incoming events that either link to a single outcome event or don't link. I'm interested in determining all the events that don't link to the outcome event. For example: Tx 1, event="message_received", id="A" Tx 2, event="message_received", id="A" Tx 3, event="message_received", id="B" Tx 4, event="message_received", id="A" ... Tx 20, event="batch_send_success", id="B" ​I would like to run a search to determine which events have not been sent; in the case above, all the events with id="A" do not have a corresponding event="batch_send_success", id="A" event, so I would like to show Tx 1, Tx 2, and Tx 4 in the search.   I tried using transaction with keepevicted=true, but that doesn't seem to work for many-to-one linkage transactions like I am trying; it works in reverse and ends up considering all "message_received" with the exception of the most recent one as evicted and gives me false negatives.   Thanks in advance for any help! ... View more