Steps to Reproduce
Navigate to System Definition > Text Indexes.
Open the table entry kb_knowledge.
In the Table-Specific Stop Words related list, add the work "for" as not a stop word.
Edit an existing KB article and add the word "for" in it.
Wait for the index job to process, or proactively re-index the Knowledge table in case several articles have been edited.
Search in the KB for the keyword "for".
Note that "for" is still considered as a stop word.
After carefully considering the severity and frequency of the issue, and risk of attempting a fix, it has been decided to not address this issue in any current or future releases. We do not make this decision lightly, and we apologize for any inconvenience. If you have any questions regarding this problem please contact ServiceNow Technical Support.
Related Problem: PRB606126