Currently we suggesting users create a Node (using NodeBuilder in 2.x) to have a client that is capable of keeping up-to-date information. This is generally a bad idea as it means elasticsearch has no control over eg max heap size or gc settings, and is also problematic for users because they must deal with dependency collisions (and in 2.x+ dependencies of elasticsearch itself).
A better alternative, and what we should document, is to run a local elasticsearch server using bin/elasticsearch, and then use the transport client to connect to that local node. This local connection is virtually free, and allows the client code to be completely isolated from the elasticsearch process. Plugins are then also easy to deal with: just install them in elasticsearch as usual.
Related to #16679
ba5be0332d removed support for degrading
to slf4j and j.u.l but didn't document this as a breaking change because
it is only breaking for folks using Elasticsearch's jar as a java client.
People do that so this counts as a breaking change.
Also, if anyone was brave enough to try and replace log4j on an installed
version of Elasticsearch that will no longer work and this documents that
as well. It doens't get a full heading and instead lives with the java
client notes. Mostly because I can't imagine it worked consistently enough
for anyone to actually do it in the first place. We just never tested it
well enough to make sure we didn't break it after it was implemented.
This commit adds a note to the migration docs regarding the reduction of
the Groovy dependencies from the groovy-all artifact to the groovy
artifact that was previously done in
180ab2493e.
Closes#16858
This commit removes the system property "es.useLinkedTransferQueue" that
defaulted to false and was used to control the queue implementation used
in a few places.
Closes#16786
Java NIO has the notion of gathering writes. These are writes that
gather data from multiple buffers into a single channel. These gathering
writes in Netty have been enabled by default with the possibility to
disable them using "es.netty.gathering". This flag was added in case
having gathering writes on by default did not work out. We have not
published this ability and sufficient time has passed to render
judgement that using gathering writes is okay.
Closes#16774
Elasticsearch should reject ids that are this long, to ensure a document
always remains retrievable for clients that impose a maximum URI length
Closes#16034
This commit removes the es.max-open-files flag as the same information
can be obtained from the cluster nodes info API, and is warn logged on
startup if it's set too low anyway.
Closes#16757
Nik Everett
javanna
Clinton Gormley
Andrey Ryaguzov
David Pilato
Lee Hinman
Jason Tedor
evanfreed
Konstantin Delchev
Martijn van Groningen
Henrik Nordvik
Boaz Leskes
Robert
gaelL
Colin Goodheart-Smithe
DeDe Morton
Simon Willnauer