code: @Override
      public String resolveAdditionalQueryParametersFromTxtRecords(final String host) {
          String additionalQueryParameters = "";
          InitialDirContext dirContext = createDnsDirContext();
          try {
              Attributes attributes = dirContext.getAttributes(host, new String[]{"TXT"});
              Attribute attribute = attributes.get("TXT");
              if (attribute != null) {
                  NamingEnumeration<?> txtRecordEnumeration = attribute.getAll();
                  if (txtRecordEnumeration.hasMore()) {
                      // Remove all space characters, as the DNS resolver for TXT records inserts a space character
                      // between each character-string in a single TXT record.  That whitespace is spurious in
                      // this context and must be removed
                      additionalQueryParameters = ((String) txtRecordEnumeration.next()).replaceAll("\\s", "");
  
                      if (txtRecordEnumeration.hasMore()) {
                          throw new MongoConfigurationException(format("Multiple TXT records found for host '%s'.  Only one is permitted",
                                  host));
                      }
                  }
              }
          } catch (NamingException e) {
              throw new MongoConfigurationException("Unable to look up TXT record for host " + host, e);
          } finally {
              try {
                  dirContext.close();
              } catch (NamingException e) {
                  // ignore
              }
          }
          return additionalQueryParameters;
      }
docs: /*
  A TXT record is just a string
  We require each to be one or more query parameters for a MongoDB connection string.
  Here we concatenate TXT records together with a '&' separator as required by connection strings