Commits on May 2, 2023

1. Fetch index settings asynchronously …

   In some cases, like using ./gradlew run, I've run into issues where
   OpenSearch crashes, complaining that we're making a blocking call on a
   listener thread, because we fetch index settings to see if a result
   transformer has been configured for the current index.
   
   I'm kind of surprised that we haven't run into this in production
   use-cases, but it may just be because assertions are not enabled in
   production. Regardless, blocking calls on listener threads are a bad
   idea, since that's how you run out of listener threads.
   
   This change makes the index settings call asynchronous and chains the
   remaining logic off of that.
   
   Signed-off-by: Michael Froh <froh@amazon.com>

   

   msfroh committed May 2, 2023
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