Provide the detail steps as to what you are doing?
Translators are deployed automatically when server starts up. The connections to data sources are accomplished through either "data-source" (JDBC sources) or "resource-adapter" (other like file, ws, mongodb etc). If you are creating the resource-adapter for MongoDB for getting a connection, how are doing it? Did you directly edit the standalone-teiid.xml? Did you CLI? Did you use web-console? or used Designer?
If you directly editing the standalone-teiid.xml, did you stop the server? If you used any other means, the server needs to be running, yes it will update the standalone-teiid.xml, but it will not reset to original state.