public Builder clearExpireTime() {
        bitField0_ = (bitField0_ & ~0x00000004);
        expireTime_ = null;
        if (expireTimeBuilder_ != null) {
          expireTimeBuilder_.dispose();
          expireTimeBuilder_ = null;
        }
        onChanged();
        return this;
      }
<pre>
The cache lifetime for the returned match. Clients must not cache this
response past this timestamp to avoid false positives.
</pre>

<code>.google.protobuf.Timestamp expire_time = 3;</code>
java-webrisk/proto-google-cloud-webrisk-v1beta1/src/main/java/com/google/webrisk/v1beta1/SearchHashesResponse.java