AndreLouisCaron opened a new pull request #322: Honor UUID interceptor in ElasticSearch sink URL: https://github.com/apache/flume/pull/322 ElasticSearch provides support for deduplication of events using the `_id` field when inserting documents using the bulk insert facility. When using the UUID interceptor with `headerName = _id` for this purpose, the logstash serializer will rename this as `@fields._id`, which is stored as though it were any other field. In order to enable deduplication of events in the ElasticSearch sink, we need to ensure the header containing the document ID is sent as `_id`, no matter what its original name is. The dynamic serializer probably does not have the same limitation, but it currently counts on the UUID interceptor's `headerName` property to be set to `_id`. This is not the default and it is unlikely to work in complex Flume networks that replicate events to multiple sinks. Therefore, I fixed it to support the same logic as the logstash serializer.
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