summary: List popular words
      description: Returns available labels
      operationId: listLPopularWords
      parameters:
        - name: seed
          in: query
          description: Random seed to return popular words
          required: false
          schema:
            type: string
            example: 123
        - name: label
          in: query
          description: Filtered label name

public class AccessTokenHelper {

    protected static final String BEARER = "Bearer";

    protected Random random = new SecureRandom();

    public String generateAccessToken() {
        return RandomStringUtils.random(ComponentUtil.getFessConfig().getApiAccessTokenLengthAsInteger(), 0, 0, true, true, null, random);
    }

    public String getAccessTokenFromRequest(final HttpServletRequest request) {