Performance implications for elasticsearch when specifying fields that won't be in the indexed documents?

I'm working on switching to using the ECS toolchain for our indices (mostly logs).

The usage notes for the generator say:

If your indices will never populate particular ECS fields, there's no need to include those field definitions in your index mappings.

I'm considering implementing this, but would like to know:

Are there performance/storage/etc. implications for elasticsearch when defining more fields than will be used in the documents in the index?

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