You'll need to do a full cluster restart from .90.x to 1.x (i.e. need to bring down all nodes). There is some information here to help reduce recovery/startup churn:
http://www.elasticsearch.org/webinars/elasticsearch-pre-flight-checklist/ But in general: 1) Stop all queries/indexing jobs 2) Flush your indexes: curl -XPOST "localhost:9200/_flush" 3) Shutdown your cluster: curl -XPOST "localhost:9200/_shutdown" 4) Backup all your data/ and config/ folders (from all nodes if you have multiple data folders/nodes) - This is important in case the upgrade fails! 5) Per node, uninstall your current ES. Be careful not to delete the data folders and your config/ files 6) Per node, install new ES and pull in your config/* files from previous install 7) Verify all config files in all nodes and all data folders 8) Start all nodes one by one -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/elasticsearch/efeccb5f-9463-4a49-a3ea-f8ea40ec9d83%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
