I just switched to using flake8 in a pre-commit hook which does a pep8/pyflakes pass on code. F isn't used in this file, but we import it because it makes it easier to import things in other files if all the elasticutils things come from search.es_utils. Because it's not used in this file, pyflakes complains. the `# noqa` at the end of the line tells it to shut up.

I don't want to litter the codebase with these, though. I'd like to use them very sparingly. Having said that, I got tired of this issue forcing me to do `git commit --no-verify`.