[Elasticsearch]: Possibility to add processors in the integration configuration

### Integration Name

Elasticsearch [elasticsearch]

### Dataset Name

All dataset

### Integration Version

1.19

### Agent Version

9.2.1

### OS Version and Architecture

Debian

### User Goal

Some external products integrate Elasticsearch in their back office, and Elasticsearch needs to be monitored as an external product as well. Some companies prefer to inject environment variables to define the namespace of data streams and grant access to that data to specific teams.
Currently, it is impossible to add a processor and therefore to easily change the namespace coming from the Elasticsearch integration.

### Existing Features

Impossible to add an agent processor to the Elasticsearch integration.

### What did you see?

Nothing to add agent processor in the Elasticsearch integration

### Anything else?

_No response_