Remotly Debug ElasticSearch in IntelliJ

README

Pretty simple once you know how.

Step 1: In IntelliJ, create a new remote debug configuration.  Name it something ElasticSearchy.  All of the default values should be fine.  The only thing you need to change is the Host value.  If ElasticSearch is gonna be running locally, just use "localhost", otherwise use the IP address of the remote machine ElasticSearch is gonna run on

Step 2: When starting ElasticSearch, just add a -D argument with the standard java remote debug values like so:
bin/elasticsearch -D "-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5005"

ElasticSearch will start and if suspend is set to 'y', it'll pause execution until you have attached the IntelliJ debugger.

Step 3: In IntilliJ, run the remote debug configuration you created in step 1.

At this point any breakpoints you have set in, say, an ElasticSearch plugin will get hit

@elbarto93 , setting ES_JAVA_OPTS did not work because the value is getting set by groovy script, hence it is getting over written.
https://github.com/elastic/elasticsearch/blob/b3f3a4312b55acd02e9291d7ae231b397e275d0b/buildSrc/src/main/groovy/org/elasticsearch/gradle/test/ClusterFormationTasks.groovy#L627
i changed the port at this line and then from commandline ran ./gradlew run --debug-jvm, then the port was 5005 instead of 8000

Thanks
Nikita