Alright, I moved my installation to another server and ran an upgrade (now OJS 18.104.22.168).
Unfortunately rebuild the index with rebuildSearchIndex does not work. I get some 25000 keywords in article_search_keyword_list but these are only keywords from the articles' titles.
pdftotext is enabled in conf.inc.php:
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index[application/pdf] = "/usr/bin/pdftotext -enc UTF-8 -nopgbrk %s - | /usr/bin/tr '[:cntrl:]' ' '"
The path to pdftotext is correct.
pdftotext is working properly when I run it from the command line.
I have no idea what's going wrong here and would appreciate your help with troublshooting very much!
It looks like the script does not finish. At least it returns the command prompt rather than giving me a message like "XYZ articles indexed".
The PHP memory_limit is set to "no limit".