Response Code When No Space

We use ElasticSearch to store events from fluentd. Recently our elasticsearch cluster was 100% full but even then there were no errors at fluentd level and it continued to push events to ES although the data seems to have gone to a black hole.

To investigate this, I would like to know what response code ES would give back to fluent(or any client via HTTP API) when storing data when:

  1. Storage was successful.
  2. Storage was not-successful due to no more free space left.
  3. Storage was not-successful due to some other reason.