Search token length for attachments

Hi everyone.

I noticed that there seems to be a limit of 13 characters on length of search strings/tokens for attachments.

When uploading a file named “Uonsecteturadi.pdf” it will not be found.

However, after renaming it to “Uonsecteturad.pdf” it shows up in the search results.

I suspect this is due to the Solr schema!?

Therein the default limit for attachments is set to 13 in line 1292:

<filter class="solr.LengthFilterFactory" min="2" max="13"/>

From my point of view this is fairly low. In our XWiki there are dozens of attachments with much longer words within the file name.