To search for an exact term, prefix the term with "=".
This ensures that the term will not be tokenized, therefore you can search
for stop words.
If both FTS and ID base search are supported for a specified or implied property, then exact matching will be used where possible.
For example, the following query will match running but will not be tokenized. If you are using stemming it might not match anything.
=running
For the cm:name field, which is in the index as both tokenized and untokized, it will use the untokenized field. For example, =part will only match the exact term "part". If you use =part* it will match additional terms, like "partners". If there is no untokenized field in the index, it will fall back to use the tokenized field, and then, with stemming/plurals, it would match.