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From Michael Miklavcic <>
Subject Re: [DISCUSS] Dropping support for elastic 2.x
Date Wed, 04 Oct 2017 16:55:51 GMT
The client I'm currently working on moving towards would *not* be backwards

The High Level Client is guaranteed to be able to communicate with any
Elasticsearch node running on the same major version and greater or equal
minor version. It doesn’t need to be in the same minor version as the
Elasticsearch nodes it communicates with, as it is forward compatible
meaning that it supports communicating with later versions of Elasticsearch
than the one it was developed for.

The 5.6 client can communicate with any 5.6.x Elasticsearch node. Previous
5.x minor versions like 5.5.x, 5.4.x etc. are not (fully) supported.


On Wed, Oct 4, 2017 at 10:45 AM, Simon Elliston Ball <> wrote:

> A number of people are currently working on upgrading the ES support in
> Metron to 5.x (including the clients, and the mpack managed install).
> Would anyone have any objections to dropping formal support for 2.x as a
> result of this work? In theory the clients should be backward compatible
> against older data stores, so metron could be upgraded without needing an
> elastic upgrade.
> In practice, we would need to do pretty extensive testing and I wouldn’t
> want us to have to code around long term support on older clients if no-one
> in the community cares enough about the older ES. Do we think there is a
> case to be made for maintaining long term support for older clients?
> Simon

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