Jetpack Search: authenticated requests are not working

[rebeccahum]

To display non-public content, we usually ask for the authenticated_requests parameter be passed into the ES args here: https://wpvip.com/documentation/vip-go/elasticsearch-on-vip-go/#non-public-content

However, we're seeing that some setups where non-public content such as drafts that are supposed to be showing are no longer showing up.

Steps to reproduce the issue

1. Assuming JP Search module is enabled, add filter to enable authenticated requests via JP:

add_filter( 'jetpack_search_es_query_args', function( $es_query_args ) {
    $es_query_args['authenticated_request'] = true;
 
    return $es_query_args;
} );

2. Ensure es args have non-public content in search (e.g. post_type as drafts)
3. Perform search

What I expected

Non-public content from that meet search arguments to returned from search.

What happened instead

Only public content meeting search arguments returned from search.