Imho, it would be nice if these fields would get a decent mapping, so we can use them to build visualisations etc. Is this on Elastic's to do or are we supposed to provide this ourselves?
not indexing the HTTP request and response headers by default was a conscious decision to avoid indexing a potentially large number of fields that don't need to be queried by the APM UI.
It is possible though to enable dynamic mappings for these fields, by setting setup.template.append_fields in the apm-server.yml.
You can also find more details about this in a previous discuss post.
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