in src/main/java/com/spotify/google/cloud/pubsub/client/Pubsub.java [701:709]
public PubsubFuture<Void> modifyAckDeadline(final String canonicalSubscriptionName, final int ackDeadlineSeconds,
final List<String> ackIds) {
final String path = canonicalSubscriptionName + ":modifyAckDeadline";
final ModifyAckDeadlineRequest req = ModifyAckDeadlineRequest.builder()
.ackDeadlineSeconds(ackDeadlineSeconds)
.ackIds(ackIds)
.build();
return post("modify ack deadline", path, req, VOID);
}