ElasticPress group meta fields

group-fields.php

<?php
add_filter(
	'ep_prepare_meta_data',
	function ( $meta ) {
		$meta_groups = [
			'group1' => [
				'_sku',
				'_sale_price_dates_from',
				'_sale_price_dates_to',
			],
			'group2' => [
				'total_sales',
				'_tax_status',
			],
		];
		$_meta       = [];

		foreach ( $meta_groups as $group => $meta_keys ) {
			foreach ( $meta_keys as $meta_key ) {
				if ( isset( $meta[ $meta_key ] ) && ! empty( $meta[ $meta_key ][0] ) ) {
					$_meta[ $group ][] = implode( ' ', (array) $meta[ $meta_key ] );
					unset( $meta[ $meta_key ] );
				}
			}
		}

		foreach ( $_meta as $group => $grouped_meta_fields ) {
			$meta[ $group ] = implode( ' ', array_unique( $grouped_meta_fields ) );
		}
		return $meta;
	}
);


add_filter(
	'ep_weighting_configuration_for_search',
	function ( $weight_config ) {
		$group_weights = [
			'post'    => [
				'group1' => 1,
				'group2' => 1,
			],
			'page'    => [],
			'product' => [
				'group1' => 10,
				'group2' => 10,
			],
		];
		foreach ( $group_weights as $post_type => $groups ) {
			if ( isset( $weight_config[ $post_type ] ) ) {
				foreach ( $groups as $group => $weight ) {
					$weight_config[ $post_type ][ 'terms.' . $group . '.name' ] = [
						'weight'  => $weight,
						'enabled' => 1,
					];
				}
			}
		}
		return $weight_config;
	}
);