[OJS 3.2.1.4] Error Lucene plugin

Hi,

After configuring the Lucene plugin in my OJS 3.2.1.4, which works perfectly when performing searches. I see that I receive different emails from some journals, with errors in the searches; which I don’t know why they happen.

The error message generated by the web service (if any): "Unfortunately the OJS search service is currently offline."

This email was generated by Open Journal Systems' Lucene search plugin.