Our elasticsearch clusters are runnin on 1.2.3/1.2.4, now we are planning to upgrade them to the newest stable version 1.6.x.
Now we have two options to upgrade:
- upgrade them to 1.3.x, then to 1.4.x, then 1.5.x, finally 1.6.x
- upgrade them from 1.2.x to 1.6.x directly
I want to know whether it is possible that upgrade to 1.6.x directly rather than version by version.
Additionally, I noticed there is a issue (https://github.com/elastic/elasticsearch/issues/10118) saying that it is highly risky to upgrade to 1.3.x or 1.4.x by rolling upgrades. Does it mean that I'd better skip the 1.3 and 1.4 version and at least upgrade to 1.5.x directly if I want to do rolling upgrades on the living cluster?