Adding in the initial bulk indexing. Still need to test locally and write unit tests.
Merge branch 'master' into bulk
Fix incorrect variable reference.
Fix addcslashes second param. Remove unused function. Add in basic error notification.
Merge branch 'master' into bulk
Add in a command to retrieve the status of the Elasticsearch server.
Fix infinite loop when there are sticky posts.
Fix array flattening for the bulk index.
Move bulk methods to ElasticPress_CLI_Command. Move methods from EP_Sync_Manager to EP_API.
Fix formatting issues (hopefully).
Move bulk post request to separate method.
Fix the result count display, was displaying blog id, not the posts synced. Add a total posts indexed after network-wide operation.

Add docblock headers to functions that were missing. Added @since comment to demarcate when these functions were added.

Clean up formatting - switch indents to tabs.
Update @since
Bring bulk branch up to date with master
Merge branch 'bulk'