bp_document_delete_meta( int $document_id, string $meta_key = '', string $meta_value = '', bool $delete_all = false )

function bp_document_delete_meta( $document_id, $meta_key = '', $meta_value = '', $delete_all = false ) {

	// Legacy - if no meta_key is passed, delete all for the item.
	if ( empty( $meta_key ) ) {
		$all_meta = bp_document_get_meta( $document_id );
		$keys     = ! empty( $all_meta ) ? array_keys( $all_meta ) : array();

		// With no meta_key, ignore $delete_all.
		$delete_all = false;
	} else {
		$keys = array( $meta_key );
	}

	$retval = true;

	add_filter( 'query', 'bp_filter_metaid_column_name' );
	foreach ( $keys as $key ) {
		$retval = delete_metadata( 'document', $document_id, $key, $meta_value, $delete_all );
	}
	remove_filter( 'query', 'bp_filter_metaid_column_name' );

	return $retval;
}