Couchbase N1Q1 query always return empty and dropping-recreating primary index fails

Hi sorry for the late reply, the problem comes again.
I’m using CouchBase (Community Edition 5.0.1 build 5003 )
Here’s the google drive link for my indexer.log

https://drive.google.com/file/d/1sK1rCNqc9XwrCm31B5sVjrdozwXjOsyu/view?usp=sharing

This time, the problem has a different behaviour…
When I do a select all query to the bucket, it only return a same set of result(count 261) but when I check the total document count in the bucket admin page, it shows a 270+. One more thing, I don’t know if it is related, the CPU usage for indexer.exe is constantly high(around 50%).

Thanks for helping!