Automatically add created, last_changed and changed_by metadata for index templates, component templates and ingest pipelines about elasticsearch HOT 6 OPEN

@ruflin that's a good thought, seems like a follow-up issue to me.

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Eventually we should also find ways to query this data: Give me the ingest pipelines that changed in the last 24h

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Pinging @elastic/es-data-management (Team:Data Management)

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While I wish we could have a standardization here, we do have a field like this for ILM policies already: modified_date. If we want to add these, it would be good to standardize on exactly what names we want.

Is there a reason you prepended an underscore to the names? I don't think we would necessarily have to do that.

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++ on standardisation.

The underscore is to indicate this is something created by the system and can't be modified by the user. It is likely also to prevent conflicts with user defined fields but agree, we might not need this.

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I don't feel strongly about the _, it was mostly just a starting point. I edited the issue to align with existing names

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