public Dataset build() {
    return new Dataset(accountName, containerName, datasetName, versionSchema, retentionPolicy, retentionCount,
        retentionTimeInSeconds, userTags);
  }
Build the {@link Dataset} object. The accountName, containerName, datasetName, versionSchema and expirationTimeMs
are required before build.
@return a {@link Dataset} object.
ambry-api/src/main/java/com/github/ambry/account/DatasetBuilder.java