Build: Conslidate dev-tools and x-dev-tools

In preparation for elastic/elasticsearch#2957, I found we have things both in the root level
dev-tools, as well as elasticsearch/x-dev-tools. Most of this stuff can
be removed as it had to do with the old manual release process. There
was also a signed license file checked in. I removed it here, we really
should not have licenses checked in IMO, and it is unclear what the
purpose of this license was for. The two remaining scripts were moved to
the root dev-tools.

Original commit: elastic/x-pack-elasticsearch@3e24ea2d56

dev-tools/create_bwc_indexes.py

@@ -19,7 +19,7 @@
 # Currently this script can only deal with versions >=2.0.0 and < 5.0. Needs more work for versions before or after.
 #
 # Run from x-plugins root directory like so:
-# python3 ./elasticsearch/x-dev-tools/create_bwc_indexes.py 2.3.4
+# python3 ./dev-tools/create_bwc_indexes.py 2.3.4
 # You can get any particular version of elasticsearch with:
 # python3 ../elasticsearch/dev-tools/get-bwc-version.py 2.3.4
 #

elasticsearch/x-dev-tools/RELEASE.md

@@ -1,51 +0,0 @@
-# Releasing x-plugins
-
-Releasing is split into two steps now. First, elasticsearch core gets a testing release.
-This release is not published on the maven sonatype repo, but is left as a staging repository.
-At the same time, the created artifacts are uploaded to the download.elastic.co S3 bucket into
-a private URL, that is comprised of the version and the commit hash.
-
-As soon as the core is uploaded there, we can use this repository to build x-plugins against it.
-
-## Release x-plugins for a release candidate
-
-In order to upload x-plugins to the elasticsearch core release candidate, you need to execute the
-`release_beta_to_s3` shell script. There are two parameters, first the version to be released and
-second the commit hash, which is part of the URL to download this beta release.
-
-```
-sh x-dev-tools/release_beta_to_s3.sh 2.0.0-beta1 468cb61
-```
-
-So, what is this script doing
-
-* Adds the S3 bucket as repository
-* Updates the versions in the pom.xml to reflect the non-snapshot version
-* runs `mvn install` into a local repository, then removes sources and emits the s3cmd command to sync with the core repo
-
-As soon as the Elasticsearch is released, this S3 bucket is just renamed. This
-means, that at this moment, the x-plugins will work for the plugin manager, 
-without you having to do anthing!
-
-However, one last step remains...
-
-## Deploying x-plugins into maven repositories
-
-For those, who want to use the jar files as part of their java projects, we have
-to update our own artifactory after the release has been done.
-
-In addition to those steps like updating documentation we have to run deploy
-to this repo. What is required for this, is the version of the release and
-the commit hash of the commit in the `x-plugins` repo. 
-
-**NOTE: This is not the same commit hash as above** in the release candidate
-process. Luckily the script should fail, when git does not find the commit!
-
-```
-sh release_to_repositories.sh 2.0.0-beta1 75964ad
-```
-
-This script checks out the specified commit hash, removes all the
-`-SNAPSHOT` suffixes and runs `mvn deploy -Pdeploy-public`. The script
-will also wait for you pressing enter before proceeding!
-

elasticsearch/x-dev-tools/license.json

@@ -1 +0,0 @@
-{"license":{"uid":"f2b32c63-3656-4883-a936-08574a62e9c2","type":"basic","issue_date_in_millis":1461628800000,"expiry_date_in_millis":1547164799999,"max_nodes":100,"issued_to":"Elastic - INTERNAL","issuer":"Steve Kearns","signature":"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"}}