> Does it even make sense to use omitTermFreqAndPositions for
> a TextField, or am I perhaps doing something I shouldn't
> be?

Yes it makes sense to disable tf, positions and norms if you don't need them. 
For example, I have this category_name field where its definition includes:

omitNorms="true" omitTermFreqAndPositions="true"

I don't need PhraseQuery, lenght normalization, index time boost, etc.
I only display three (rows=3) category names for a given query.

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