public java.lang.String getWindowEndTime() {
      java.lang.Object ref = windowEndTime_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        windowEndTime_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }
<pre>
The time by which the maintenance disruption will be completed.
This timestamp value is in RFC3339 text format.
</pre>

<code>optional string window_end_time = 7;</code>

@return The windowEndTime.
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/UpcomingMaintenance.java