public Builder mergeRequestMetadata(com.google.cloud.talent.v4.RequestMetadata value) {
      if (requestMetadataBuilder_ == null) {
        if (((bitField0_ & 0x00000004) != 0)
            && requestMetadata_ != null
            && requestMetadata_
                != com.google.cloud.talent.v4.RequestMetadata.getDefaultInstance()) {
          getRequestMetadataBuilder().mergeFrom(value);
        } else {
          requestMetadata_ = value;
        }
      } else {
        requestMetadataBuilder_.mergeFrom(value);
      }
      if (requestMetadata_ != null) {
        bitField0_ |= 0x00000004;
        onChanged();
      }
      return this;
    }
<pre>
Required. The meta information collected about the job searcher, used to
improve the search quality of the service. The identifiers (such as
`user_id`) are provided by users, and must be unique and consistent.
</pre>

<code>
.google.cloud.talent.v4.RequestMetadata request_metadata = 3 [(.google.api.field_behavior) = REQUIRED];
</code>
java-talent/proto-google-cloud-talent-v4/src/main/java/com/google/cloud/talent/v4/SearchJobsRequest.java