johannesjo

Inorder to change default document root for a domain hosted in a plesk control panel we need to create vhost.conf file in the directory in which http.include for the domain resides. Directly changing the document root entry in httpd.include causes the modification to be overwritten with default entry since plesk overwrites entries in configuration files with database entries 
Entries to be put in the vhost.conf follows

DocumentRoot /path/to/your/new/root
<Directory  /path/to/your/new/root>
         # Put this if you really need all options?
         Options Indexes ExecCGI FollowSymLinks MultiViews
         AddHandler cgi-script .cgi
         # are you using .htaccess files? if not, set it from all to none
         AllowOverride all