Update HTTP Auth for your Solr Index

1. ​GET https://opensolr.com/solr_manager/api/update_http_auth
2. Parameters:
   1. ​email - your opensolr registration email address
   2. api_key - your opensolr api_key
   3. ​core_name - the name of the core you wish to add or update HTTP Auth. protection for
   4. username - the username you want to use for the core you wish to protect using HTTP Auth.
   5. password - the password you want to use for the core you wish to protect using HTTP Auth.

3. Example: https://opensolr.com/solr_manager/api/update_http_auth?email=PLEASE_LOG_IN&
   api_key=PLEASE_LOG_IN&core_name=my_solr_core&username=index_auth_username&password=index_auth_password