Dev server plugin directory

Is it possible to set the plugin_directory for the dev server?

I am trying to test out integrating vault with my oracle db and I need to install the oracle plugin. I keep getting this error –

Error writing data to sys/plugin/catalog/oracle-database-plugin: Error making API request.

URL: PUT http://127.0.0.1:8200/v1/sys/plugin/catalog/oracle-database-plugin
Code: 404. Errors:

* 1 error occurred:
	* unsupported path