It seems that there was a way to create a custom track with an index operation to load documents in ES with custom IDs and routing keys, as described in the following post:
As this is not valid for rally's current version, how can we perform this operation now?
Based on this post (How to index routing id based document in rally), I was trying to use the same approach, with "operation-type": "index". Got a message that this is an invalid operation.
Just realized that there is a property for documents called includes-action-and-meta-data. That solved the problem.
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