Elastic-doc-manager

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- Significant performance improvements because operations are buffered.
- BulkIndexErrors are now caught and reraised as OperationFailed.
- Support for connecting to multiple Elasticsearch hosts. See
https://github.com/mongodb-labs/mongo-connector/wiki/Usage-with-Elasticsearchconnecting-to-multiple-elasticsearch-hosts.

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- Bug fix for namespace information saved in the mongo-connector metadata index.
- Support AWS Elasticsearch Service Request Signing.

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This was the first release of elastic-doc-manager.