Thanks for the updates, unfortunately no luck. By the way uppercase "THAT", "ARE" will not be indexed. So I am really no idea what happened here.

Hi Nilesh, Thanks for replying, I just tried adding the ignoreCase = true but they are still being indexed.  <Stop jcr:primaryType="nt:unstructured" ignoreCase="{Boolean}true" words="stopwords.txt"> <stop...

Just several words are still being indexed, the rest of them work as expected! Here is my xml file:  

Hi Everyone,I'm currently adding a custom stopwords.txt file to my custom Lucene index in AEM to filter out common stopwords during search. While most of the words in my list are being excluded as expected, I've noticed that some very common ones like "are", "was", and "that" are still being indexed...