Please don't post pictures of text or code. They are difficult to read, impossible to search and replicate (if it's code), and some people may not be even able to see them
It sounds like this will come down to how the field is mapped, so can you check that?
Assuming it is correct you are searching against the text field speaker not keyword fields speaker.keyword for an exact match... text field will ignore cas
Run these 1 by one below and observe the difference you will sett
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