The script(s) should output a sensible error message when Solr doesn't appear to be running.
updatesearchindexsolr.php always fails in a multicore setup
eZFind master: https://github.com/ezsystems/ezfind/commit/ec4f9828a1f04208f0cec0e827c7a8959c9368f4
This issue has been automatically closed due to the lack of activity over a long period of time. It is very likely that it is obsolete, but if you think it is still valid, do not hesitate to reopen it and mention why.