code: public File getWisdomRootDirectory() {
          File wisdom;
          if (wisdomDirectory == null) {
              wisdom = new File(buildDirectory, Constants.WISDOM_DIRECTORY_NAME);
          } else {
              this.getLog().debug("Using Wisdom Directory : " + wisdomDirectory.getAbsolutePath());
              wisdom = wisdomDirectory;
          }
  
          if (wisdom.mkdirs()) {
              this.getLog().debug(wisdom.getAbsolutePath() + " directory created.");
          }
          return wisdom;
      }
docs: Gets the root directory of the Wisdom server. Generally it's 'target/wisdom' except if the
  {@link #wisdomDirectory} parameter is configured. In this case,
  it returns the location specified by this parameter.
  
  @return the Wisdom's root.