BulakAddElasticSearch processor should support mapping / dynamic template creation

[mathieu-rossignol]

The ES processor allows to put some documents in ES, but does not allow to set ES mapping nor dynamic templates.

Instead of creating mapping or dynamic template by hand before running logisland for the first time against ES, it would be nice to have the ability to have the ES processor putting the ES mapping or dynamic template himself, before creating documents.

This implies the ability to have an initialization phase done once for all. A path to the json mapping/dynamic templates files could be provided at configuration time. It could also be a path to a directory (HDFS based ?), or json embedded in the jars?....