* Add Undertow 2.x plugin

* Undertow: Interceptor method executeRootHandler in class Connectors

* Add ignore to bytebuddy agent.

* Fix a wrong name.

* Make sure toolkits are excluded.

* Fix CI

* Format codes.

* Remove MethodGraph compiler

* close inputStream safety

* FIX NPE in AlarmService

* add user

* add user

* FIx NPE in InstanceMetricAlarmAssertWorker

alphabeta to alphabet

* fix memory leak in HystrixPlugins

* add heart beat handler to jetty

* add heart beat handler to jetty

* update 5.x grpc version form 1.10 to 1.14 and  Solve the resulting guava and log4j version conflicts

* Specify guava version 20.0

* update parrent pom guava version

* 用户接入 上上签

* add user

* Update CHANGES.md

* Update submodule skywalking-ui

* Update submodule skywalking-ui

* Update submodule skywalking-ui

* Update submodule skywalking-ui

* Update submodule skywalking-ui

* Update submodule skywaling-ui

* Update submodule skywalking-ui

* Fix bug stop stopSpan when not createSpan

* Fix bug stop stopSpan when not createSpan

* change the agent log level to millisecond

* add the function of the specified-agent-config

* Update README_ZH.md

* Use -D  to set the specified config path

* add docs

* update docs

* change method name

* add link

* change the function name

* change the key

* format doc

* Update submodule skywalking-ui

* Update submodule skywalking-ui

* Update submodule skywalking-ui

* Update submodule skywalking-ui

* Update submodule skywalking-ui

* Update submodule skywaling-ui

* Fix bug stop stopSpan when not createSpan

* Fix bug stop stopSpan when not createSpan

* change the agent log level to millisecond

https://github.com/apache/incubator-skywalking/pull/1574 removed the
maven wrapper jar. The shell script will try wget and then this
downloader if missing. It is very likely in windows and small vms for
people to not have wget installed, so this will prevent support problems
(and is why the wrapper includes this)

* Delete maven-wrapper.jar

* Update .gitignore

* [Agent] Provide plugin for Elasticsearch 5.x

Add [Agent] Elasticsearch transport client plugin

fix component name

add elasticsearch component

add elasticSearch component into component-libraries.yml

* update support list

* update PlainListenableActionFutureInterceptor.java

* fix set span attributes

* clear runtimeContext

* remove extra plugins