public java.lang.String getEventId() {
      java.lang.Object ref = eventId_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        eventId_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }
<pre>
Optional. Event ID of the input/output streams.
This is useful when you have a StreamSource/StreamSink operator in the
Analysis, and you want to manually specify the Event to read from/write to.
</pre>

<code>string event_id = 8 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The eventId.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/Process.java