lazy_load_term_meta query param is always true

[nickdaugherty]

Due to how WP_Query initializes default query parameters, and ES WP Query's interaction with WP Query, the lazy_load_term_meta param ends up always being set to true when the internal query to fetch posts by id runs.

This ends up triggering get_the_terms() excessively, which leads to high numbers of cache and/or db reads.

The problem can be most readily seen by watching the $q var here:

es-wp-query/class-es-wp-query-shoehorn.php

Lines 218 to 220 in 5b6d5d0

	$q = $query->query = $this->original_query_args;
	$query->parse_query();
	$q = array_merge( $current_query_vars, $q );

Before $query->parse_query(); is run, lazy_load_term_meta is still false...yet after it has flipped to true.

As a workaround, it can be bypassed with a filter like this:

add_filter( 'pre_get_posts', function( &$query ) {
   $query->set( 'lazy_load_term_meta', false );

   return $query;
}, 9999 );