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Purpose
This PR adds an exception to be thrown when an index response contains errors.
Description
I discovered after a couple hours of troubleshooting why my indexing wasn't working with my custom mapping using elastic-migrations. I had to jump into my vendor directory and dump the response ES was replying back with, but unfortunately no errors are handled, logged, or returned.
Without any error handling, I can't use this package in production, as my indexing may suddenly stop working and I won't have any knowledge of its failure without enabling some sort of logging mechanism inside of ElasticSearch itself.
References
This PR abides by ElasticSearch's outlined response body for bulk operations.
https://www.elastic.co/guide/en/elasticsearch/reference/master/docs-bulk.html#bulk-api-response-body
Let me know if you would like anything adjusted or have any comments/criticisms of this PR. I'm all for abiding by whatever style you would like 👍
Thanks!