We suspect we need two styles of refresh:

• a global one which flushes all on SearchFactory (useful for testing).
• one which setups a "block on commit" making the changes from the current TX visible to follow up operations of the same thread.

Proposals:
SearchFactory#forceVisibility()

FullTextSession#onCommit().blockUntilIndexesUpdated();
or
FullTextSession#onCommit().makeChangesVisible();
FullTextSession#onCommit().awaitUntilChangesAreVisible(); <- favourite so far

Not expected to work on the JMS slaves. Throw an exception?