Only the kept terms are chosen as descriptive terms so it is more likely that the mapping isnt happening as you would like. Try setting the synonyms in the parse node and rerunning. Double check the terms in the filter viewer that they are mapped as expected and rerun the clustering after that.
If part-of-speech tagging is on, another alternative explanation is that "texture_analysis" is being tagged in several ways and you see in the descriptive terms a version that wasn't mapped to "text_analysis". The descriptive terms entry in the data set does not show the part-of-speech tag so it is possible for the same term (without the tag) to show up in different ways in that descriptive term report becuase it occurred multiple times and with different part-of-speech tags.
Russ
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