public Builder mergeExpireTime(com.google.protobuf.Timestamp value) {
        if (expireTimeBuilder_ == null) {
          if (((bitField0_ & 0x00000004) != 0)
              && expireTime_ != null
              && expireTime_ != com.google.protobuf.Timestamp.getDefaultInstance()) {
            getExpireTimeBuilder().mergeFrom(value);
          } else {
            expireTime_ = value;
          }
        } else {
          expireTimeBuilder_.mergeFrom(value);
        }
        if (expireTime_ != null) {
          bitField0_ |= 0x00000004;
          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