public synchronized void bootstrap(List<InetSocketAddress> addresses) {
        this.needFullUpdate = true;
        this.updateVersion += 1;
        this.metadataSnapshot = MetadataSnapshot.bootstrap(addresses);
        this.bootstrapAddresses = addresses;
    }
@return a mapping from topic names to topic IDs for all topics with valid IDs in the cache
clients/src/main/java/org/apache/kafka/clients/Metadata.java