public boolean hasEndTime() {
      return ((bitField0_ & 0x00000020) != 0);
    }
<pre>
Required. The end time of the span. On the client side, this is the time
kept by the local machine where the span execution ends. On the server
side, this is the time when the server application handler stops running.
</pre>

<code>.google.protobuf.Timestamp end_time = 6 [(.google.api.field_behavior) = REQUIRED];
</code>

@return Whether the endTime field is set.
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/Span.java