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