Commits on Jun 26, 2017

1. Not retrying in case of isSuccessful() being false. …

   If `isSuccessful()` returns false for a bulk indexing result, retrying
   the whole bulk will lead to infinite loops in case of index mapping
   errors or other permanent errors.
   
   This change also adds an informational logging message whenever a bulk
   was indexed successfully on the n-th (n > 1) attempt, indicating that
   indexing has recovered from a formerly erroneous condition.
   
   Fixes #3938.

   

   dennisoelkers committed Jun 26, 2017
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2. Adding tests for bulk indexing retrying.

   

   dennisoelkers committed Jun 26, 2017
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3. Using explicit timezone in test.

   

   dennisoelkers committed Jun 26, 2017
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4. Adding license header.

   

   dennisoelkers committed Jun 26, 2017
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