Upgrading from 0.20.6 to 1.1.1

Elastic Stack Elasticsearch
2

0.20.6 uses Lucene 3 and 1.1.1 uses Lucene 4. Lucene is always backwards
compatible for at least 1 major version, so your data should be fine and
there is no need to reindex. Others might disagree, but I would simply
backup the data and run the latest version. An optimize might help force
older segments into the latest Lucene 4 format.

Prior to version 1.x, you cannot run clusters with different major
versions. You will need to do a full cluster restart. If you are using a
Java client, they would also need to be upgraded.

You will greatly benefit from an upgrade. The memory improvements in Lucene
4 alone (ES versions 0.90+) are worth it.

Cheers,

Ivan

On Wed, May 28, 2014 at 2:33 PM, ciatog keith.webster@gmail.com wrote:

I currently have elasticsearch on 3 production servers with an average of
30 sites per server.

Initially version 0.20.6 of elasticsearch was installed but I'd like to
move them all up to 1.1.1 to take advantage of new features but also to not
fall behind even more then has already happened.

The option of upgrading to 1.1.1 on the servers and then regenerating all
indexes is something that could be done as a last option but since each
site depends on the search so extensively and would need to be down for
some time I'd rather avoid that if at all possible.

Here are my questions:

  • Do indexes created in 0.20.6 work in 1.1.1?
  • Has anyone ever ran more then one instance of elasticsearch, both with
    different version numbers on the same server?
  • Are there other options here that I haven't considered that someone
    else has used successfully in this kind of situation?

Any suggestions or help is greatly appreciated.

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