Based on your description, it sounds like you are logging in to the GUI on the indexer, and enabling the data models there.
The data models should not be accelerated on the indexers themselves. You should only enable acceleration on the search heads.
Note that the data will still reside on the indexers, even though they are enabled on the search heads.
It also sounds like acceleration is not enabled on your search head, which is why you do not see any data when using summariesonly=true. Once you enable acceleration on the search heads, you should be able to see data with that option.
If it is already enabled, and you are not seeing data with summaries only, it is possible that the acceleration searches are not running for some reason or the other. Look through the _internal logs and the monitoring console search dashboards, if that is the case.
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