By default Elastic APM data is stored in separated indices following the format:
Data types are described here.
To get an overview of existing indices you can run:
To query all documents collected with a specific APM Server version:
To query a specific type, for example transactions:
If you are interested in the settings and mappings of the Elastic APM indices, first run a query to find template names:
Then you can retrieve the specific template you are interested in:
Read more about Index Templates and how they are used.
Alternatively, use the Kibana Index Management UI. When clicking on a specific index you can view the settings and mapping for it.