EnrichRecordsElasticsearch processor should allow to rename field names

[mariemat]

Expected behavior and actual behavior.

When using the EnrichRecordsElasticsearch processor, the behavior is to add fields coming from elasticSearch into the current Record.
However, there might be some field naming conflicts, or field formatting (like underscore or camelCase) that are not aligned.

Steps to reproduce the problem.

N/A

Specifications like the version of the project, operating system, or hardware.

I'd like to be able to rename a field coming from ElasticSearch directly from there.
This could be done by allowing "es.includes.field" to support renaming with :
es.includes.field: id:item_id, description:item_description

The ':' character says that the left side is the name of the field coming from ES, and the right side is the name of the field to create into the Record.