Notice: Undefined index: new_content_type_here in search_index_form_alter() (line 44 of search_index.module).

For any new custom content type it's giving:

Notice: Undefined index: new_content_type in search_index_form_alter() (line 44 of /home/website_username/public_html/sites/all/modules/search_index/search_index.module).

I'll fix this and roll out the new release soon...