I'm trying to show the results only for posts which has a custom meta_key "my_metakey", the filed also should not be empty.
I've tried to modify the sql_query inside the sphinx.conf file with no luck.
I'm not familiar with the way sphinx uses the sphinx.conf file, so not sure how many edits are required to achieve this.
The plugin I'm using is https://wordpress.org/plugins/wordpress-sphinx-plugin/
Any help is highly appropriated!