public function getLookupForDatabase( $dbName ): MatchingTermsLookup {
	$loadBalancer = $this->loadBalancerFactory->getMainLB( $dbName );

	$databaseTypeIdsStore = new DatabaseTypeIdsStore(
		$loadBalancer,
		$this->objectCache,
		$dbName,
		$this->logger
	);

	return new DatabaseMatchingTermsLookup(
		$loadBalancer,
		$databaseTypeIdsStore,
		$databaseTypeIdsStore,
		$this->entityIdComposer,
		$this->logger
	);
}

private function getDBConnection( $index, $flags = 0 ) {
	return $this->loadBalancer->getConnectionRef( $index, [], $this->domain, $flags );
}

$this->loadBalancer->resolveDomainID( $this->domain )

private function getDbr() {
	return $this->lb->getConnection( ILoadBalancer::DB_REPLICA, [], $this->databaseDomain );
}