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Follow up on SOLR-5518 and SOLR-5287. We need to add proper security for writing files to Solr.
I can't pursue this for some time. If we decide to pull this out, we need to ust remove EditFileRequestHandler, that should do it.
SOLR-7236 Securing Solr (umbrella issue)
SOLR-5287 Allow at least solrconfig.xml and schema.xml to be edited via the admin screen
SOLR-5518 Move editing config files into a new handler