Indexer initialization plugin

[AlexRuiz7]

Description

As part of the new Data Persistence Model to be implemented across Wazuh, we want to develop a plugin for the Wazuh Indexer to ensure that all of its requirements are ready during its initialization. The initialization process would consist of these currently identified requirements (these may change):

• Creating the stateless stream indices and their index templates (mappings and settings).
• Creating the stateful indices and their index templates (mappings and settings).
• Creating the agent index and its index template (mappings and settings).
• Creating the commands index and its index template (mappings and settings).

On this issue, we will design, build and test an MVP of this plugin.

Functional requirements

• The plugin's uses OpenSearch's lifecycle to initialize the features mentioned above.
• The plugin includes error handling to notify the users of errors in an understandable manner.
• The Wazuh Indexer will not allow indexing until it's being initialized correctly.

Implementation restrictions

• We will use Java as the programming language.
• The initialization plugin will be included in the Wazuh Indexer packages by default.

Plan

• Transform the PoC plugin into a production-ready plugin #10
• Create UML diagrams for the wazuh-indexer-setup plugin #11
• Create workflow to build packages #13
• Implement agent index creation #35
• Implement stateful (inventory) indexes creation #41
• Implement stateless (alerts) index creation #43

/* Each of the tasks above will be broken down into smaller tasks as needed, including testing and documentation.