Added nifi.bootstrap.sensitive.key to Bootstrap Properties section in Admin Guide
This closes
@@ -2147,6 +2147,9 @@ take effect only after NiFi has been stopped and restarted.
|`java.arg.N`|Any number of JVM arguments can be passed to the NiFi JVM when the process is started. These arguments are defined by adding properties to _bootstrap.conf_ that
begin with `java.arg.`. The rest of the property name is not relevant, other than to differentiate property names, and will be ignored. The default includes
properties for minimum and maximum Java Heap size, the garbage collector to use, etc.
+|`nifi.bootstrap.sensitive.key`|The master key in hexadecimal format for encrypted sensitive configuration values. When NiFi is started, the master key is used to decrypt sensitive values from the _nifi.properties_ file into memory for later use.
+
+The Encrypt-Config Tool can be used to specify the master key, encrypt sensitive values in _nifi.properties_ and update _bootstrap.conf_. See the <<toolkit-guide.adoc#encrypt_config_tool,NiFi Toolkit Guide>> for an example.
|`notification.services.file`|When NiFi is started, or stopped, or when the Bootstrap detects that NiFi has died, the Bootstrap is able to send notifications of these events
to interested parties. This is configured by specifying an XML file that defines which notification services can be used. More about this
file can be found in the <<notification_services>> section.
