omitNorms="true" on a field will have following effect:
1. length normalization will not work on the specific field--> Which means
matching documents with shorter length will not be preferred/boost over
matching documents with greater length for the specific field, at search
time.
2. Index time boosting will not be available on the field.
If, both the above cases are not required by you, then, you can set
"omitNorms=true" for the specific fields.
This has an added advantage, it will save you some(or a lot of) RAM also,
since, with "omitNorms=false" on total "N" fields in the index will require
RAM of size:
Total docs in index * 1 byte * N
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