reindex option for extractors

Ive been going over graylog2 recently and couldnt find if their was a reindex option. It would be nice to have with regards to extractors , so newer extractors can be applied to existing data, obviously this would need to be low priority compared to the indexing operations, but this would be really useful. Coming from a Splunk background, to an ELK (kibana) and graylog2 background, the one feature I miss is this.