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Re: ElasticSearch use of rest client (instead of TransportClient)

The original reason for having separate adapters was because the ES Java-Client SDKs require different library versions which aren't binary compatible. Having separate modules just seemed to be the simplest solution. If you can make sure this is not going to be a problem for users, I'd be all for unifying the adapters. Changing the dependency and the schema factory name are IMO not problematic.

Mit freundlichen Grüßen,
*Christian Beikov*
Am 22.06.2018 um 19:07 schrieb Andrei Sereda:
1) If we go single (and separate) ES adapter route, people will have to
change their existing maven dependencies as well as ES schema configuration
(at least SchemaFactory name). I'm not sure if there are any explicit (or
implicit) backwards compatibility policies in calcite. There are (albeit)
small implications for end-user.

On Fri, Jun 22, 2018 at 12:54 PM Michael Mior <mmior@xxxxxxxxxx> wrote:

1) I personally would be open to this unless there's strong evidence of use
of the ES2 adapter.

2) Calcite already depends on Jackson in core and both ES modules, so this
isn't a concern.
Michael Mior

Le ven. 22 juin 2018 à 12:37, Andrei Sereda <andrei@xxxxxxxxx> a écrit :

Some questions regarding this change:

1) Should one remove ES2 and ES5 adapters (maven modules) in favor of
single one: just ES ? This will be backwards incompatible change. Or keep
them as is and create a new module ? There is also quite a bit of ES
related code in calcite-core.

2) Since I need to create / parse JSON formats, ES adapter would have to
depend on some JSON library (most likely existing Jackson). Is that
acceptable ?

On Fri, May 18, 2018 at 4:29 PM Andrei Sereda <andrei@xxxxxxxxx> wrote:

I believe this shouldn't be an issue with http client (contrary to

On Fri, May 18, 2018, 16:16 Christian Beikov <

That's mainly because the Java drivers changed in a way that made
impossible to use the same adapter. I might be wrong, but I think the
ES5 adapter doesn't work with an ES2 server instance just like the ES2
adapter doesn't work with an ES5+ server instance.

If all of this could just go away, that would be great :)

Mit freundlichen Grüßen,

*Christian Beikov*
Am 18.05.2018 um 21:19 schrieb Andrei Sereda:
Yes it should be, since it is just an http client (apache http).
ElasticSearch Rest API (query API) didn't change much

Next question would be : why there is a need in two separate modules
elasticsearch2 and elasticsearch5

On Fri, May 18, 2018 at 3:11 PM, Christian Beikov <
christian.beikov@xxxxxxxxx> wrote:

Hey Andrei,

that would be awesome! Do you know by any chance if the low level
is also compatible with older ES versions?

Mit freundlichen Grüßen,

*Christian Beikov*
Am 18.05.2018 um 20:45 schrieb Andrei Sereda:


ES TransportClient is deprecated in 7.0 (to be removed
in 8.0) in favor of http rest client(s). Would you consider a
switching to Rest Low-Level Client
has much fewer dependencies) ?


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