Filter imported email by string in body

What is the best way to retrieve emails filtered by a string in the body? The exchangelib documentation states

WARNING: Filtering on the ‘body’ field is not fully supported by EWS. There seems to be a window

before some internal search index is populated where case-sensitive or case-insensitive filtering

for substrings in the body element incorrectly returns an empty result, and sometimes the result

stays empty.