- If the "iterateOver" field contains neither "," or "/" then it is treated as an iterator over a metadata field, just as described under Specifying Entities, section "Create Entities from Arrays of Items".
- To iterate just over a single entity type, use "dummy", eg "entity1_index/dummy". However there is currently a known bug where "entity1" must be present, eg "entity2/dummy" will not work.
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