Any changes to nifi registry properties needs nifi services restart

$NIFI_HOME/conf/nifi.properties

1. external properties files for variable registry
2. supports a comma delimited list of file locations
   nifi.variable.registry.properties=/home/user/nifi_prop/customn_environment.properties

The above customn_environment.properties contains the below properties
user_name=bala
password=bala_password

going forward if we add new properties to customn_environment.properties as below,

beeline_url=beeline.url

need Nifi service restart, but our business requirement needs the property to reflect without a restart.