README: Flesh out with usage examples
README: Flesh out with usage examples

The link to Elastic Search's 'index' is off by one, because there are
two 'index' ids on the glossary page.  I've filed a bug [1], but until
it's fixed just link to the preceding entry.

[1]: https://github.com/elasticsearch/elasticsearch.github.com/issues/511

wking/bes