public String getRecordID() {
      return fields.get("WARC-Record-ID");
    }
An identifier assigned to the current record that is globally unique for its period of
intended use. No identifier scheme is mandated by this specification, but each record-id
shall be a legal URI and clearly indicate a documented and registered scheme to which it
conforms (e.g., via a URI scheme prefix such as `http:` or `urn:`).
@return The record's `WARC-Record-ID` header field, as a string.
hbase-it/src/test/java/org/apache/hadoop/hbase/test/util/warc/WARCRecord.java