public Builder clearEventId() {
      eventId_ = getDefaultInstance().getEventId();
      bitField0_ = (bitField0_ & ~0x00000002);
      onChanged();
      return this;
    }
<pre>
Required. A unique identifier, generated by the client application.
</pre>

<code>string event_id = 2 [(.google.api.field_behavior) = REQUIRED];</code>

@return This builder for chaining.
java-talent/proto-google-cloud-talent-v4/src/main/java/com/google/cloud/talent/v4/ClientEvent.java