I am posting this as helpful information for others. We were using on Linux. We noticed that PDF attachments were not being indexed, and therefore the content in those documents was not searchable.
We reviewed these forums and Google. Based on that research, we checked the Database Properties “Index attached files” and “use conversion filters on supported files”. They already were selected, so that was not the problem.
After more research, we then applied these changes to the notes.ini file on the server:
FT_BINARY_FILTER_OFF=0
OS400_KEYVIEW_CSID=0052
PLATFORM_CSID=052
That did not help.
Finally, we determined that the problem was the version of Linux. We were using Ubuntu. When we built a test server using CentOS, that indexed PDF files with no problems. We also did some tests on a server running Fedora, and that also worked. I don’t know if any of these versions are considered supported or not, but it appears that Ubuntu is less compatible with Domino than the others, at least as far as full text indexing is concerned.