public SystemDescriptor getSystemDescriptor() {
    return this.systemDescriptor;
  }
Additional system-specific properties for this stream.
<p>
These properties are added under the {@code streams.stream-id.*} scope.

@param streamConfigs system-specific properties for this stream
@return this stream descriptor
samza-api/src/main/java/org/apache/samza/system/descriptors/StreamDescriptor.java