Hi @Alexandros888,
the template that you are changing apm-7.7.0-transaction only contains the settings, the mappings are actually set in the apm-7.7.0 template and shared for all apm indices. All the apm templates are versioned, which means that any manually applied changes via Kibana will only be valid for the current version. Therefore I'd generally advise to use configuration options in the apm-server.yml when available. Please see my answer to a similar question in another discuss post on how to customize the template via APM Server.
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