List<Path> findLogFiles(Path workingDir) throws IOException {
    Predicate<Path> logFileSelector = (Path file) -> file.toString().toLowerCase().contains(".log");
    return findFiles(workingDir, logFileSelector);
  }
@return size of file in bytes
geode-gfsh/src/main/java/org/apache/geode/management/internal/cli/util/LogExporter.java