Backup and Upgrade Elasticsearch to latest version

We have already done application upgrades with Elastice search and erlang. Could you please provide more details about your application (I mean the existing architecture) so that we will consult with our larger team in offshore(India) and let you know how much feasible it is and will update you with the feasible plans. Thanks & Regards, Sam.

i have already worked on upgrading elasticsearch from 0.90 to 1.2.2 with yajsw (service wrapper) with plugins installed (like jetty). I have also upgraded elasticsearch from 1.2.2 to 1.24 using ElasticSearch in built service wrapper. I have also upgraded elasticsearch from 1.2.4 to 1.4.4 along with shield plugin and Marvel. I all the above upgradation mentioned i have also handled maintaining backup and worked with Q/A teams to insure the upgradation is successful My Exprerience with elasticsearch is almost 2 years , include indexing , managing automated index build and implementing search. I have upgraded the search queries from tradational And filters to more fast and robust Bool filters across different types of queries (Aggregation, query_string, prefix. ngram ,) My Bids will be negotiable as i have already bid on the lower segment of cost slab. Thanks Ajay