Can I specify the timezone for all time fields?

I checked the official documentation but couldn't find any information regarding this. The only relevant processor is add_locale, but it doesn't fully meet my needs. I have a requirement to collect data from different time zones and convert it to my local time zone before inserting it into Elasticsearch. Is there any configuration for this? Or are these time data fixed to UTC in the code, and I need to adjust the code myself?

The issue names no files, tests, or entry points. Start by reviewing the official documentation and the add_locale processor, then determine whether timezone conversion is configurable or fixed to UTC. Done should be a clear answer about supported configuration or a defined implementation scope.

Written by the indexing model from the issue text.