Running ElasticSearch in Foreground

[soixantseize]

Under ElasticSearch, this statement is no longer valid:

Start a local elasticsearch server with:

$ elasticsearch -f
(The -f option tells it to run in the foreground, so you can stop it with Ctrl+C.)

Per elasticsearch documentation, looks like the -f switch is no longer needed to run in the foreground.

[soixantseize]

Submitted pull request to update readme.md