'enjoy' should have been captured , am unable to find any documentation on the dictionary details only you can see the below
So probably they didn't keep this keyword in the dictionary.
When I said you to define manually I was referring to creating of custom dictionary to your needs.
And regarding the performance it depends on how many number of texts you kept in the dictionary and you can keep the filter in "preprocess" tag in the config file to restrict the index to create with only those terms, that should be faster
Regards,
Krishna Tangudu