Using solr-core-4.6.1.jar on solr-5.5.4 server

Hello, we want to update our Solr Server to *solr-5.5.4*. For the API calls on this server, we only can use *solr-core-4.6.1.jar*, because it is maintained by an external vendor and we cannot upgrade the library ourselves. I tested this constellation shortly and seemed to work fine. Even so, do yo

Upgrading solr 5.2 to solr 5.5

Hello, we are trying to upgrade solr 5.2 to solr 5.5. In solr 5.2 we had an own, customised version of solr.war and we put it under solr-5.2.1/server/webapps/ (we overwrote the default solr.war), so on the solr startup, the war was extracted to solr-5.2.1/server/solr-webapp/ Since https:/