anchor.diff:  
   The `bin/solr` script allows enabling or disabling Basic Authentication, allowing you to configure authentication from the command line.
   
  -Currently, this script only enables Basic Authentication.
  +Currently, this script only enables Basic Authentication, and is only available when using SolrCloud mode.
   
   === Enabling Basic Authentication
   
  
positive.code: `-updateIncludeFileOnly`::
  When *true*, only the settings in `bin/solr.in.sh` or `bin\solr.in.cmd` will be updated, and `security.json` will not be created.
  
  // TODO 6.6 clarify when this is required
  `-z`::
  Defines the ZooKeeper connect string.
  
  `-d`::
  Defines the Solr server directory, by default `$SOLR_HOME/server`. It is not common to need to override the default.
  
  `-s`::
  Defines the location of `solr.solr.home`, which by default is `server/solr`. If you have multiple instances of Solr on the same host, you likely need to define this.
  
  === Disabling Basic Authentication
  
  
negative.code: 
  The `bin/solr auth enable` command makes several changes to enable Basic Authentication:
  
  * Creates a `security.json` file and uploads it to ZooKeeper. The `security.json` file will look similar to:
  +
  [source,json]
  ----
  