The configuration files for a Solr collection are stored in a directory called
instance directories. Learn how to modify the directory and make it available to Solr by
uploading the contents to ZooKeeper.
In this case, configuration files for a collection are
contained in a directory called an instance directory. An
instance directory is a named set of configuration files. You can download and edit the
configuration locally and then upload the directory to ZooKeeper as a named
configuration set. If your instance directory is already referenced by a collection,
make sure to reload it for configuration changes to take effect.