public Builder clearEndTime() {
          bitField0_ = (bitField0_ & ~0x00000004);
          endTime_ = null;
          if (endTimeBuilder_ != null) {
            endTimeBuilder_.dispose();
            endTimeBuilder_ = null;
          }
          onChanged();
          return this;
        }
<pre>
Optional. The ending timestamp for messages to import.
</pre>

<code>.google.protobuf.Timestamp end_time = 3 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/SlackSource.java