How do I troubleshoot "Error injecting constructor" when adding an amazon S3 repository to ElasticSearch? -

i've been following instructions here , i've completed step 1, installation of plugin. i'm trying add snapshot executing following command in sense:

put /_snapshot/elasticsearch {      "type": "s3",      "settings": {          "bucket": "somebucket",          "base_path" : "elasticsearch",          "secret_key": "xxx",          "acess_key" : "xxx"         } } 

from following error:

{    "error": "repositoryexception[[elasticsearch] failed create repository]; nested: creationexception[guice creation errors:\n\n1) error injecting constructor, java.lang.noclassdeffounderror: org/elasticsearch/common/blobstore/immutableblobcontainer\n  @ org.elasticsearch.repositories.s3.s3repository.<init>(unknown source)\n  while locating org.elasticsearch.repositories.s3.s3repository\n  while locating org.elasticsearch.repositories.repository\n\n1 error]; nested: noclassdeffounderror[org/elasticsearch/common/blobstore/immutableblobcontainer]; nested: classnotfoundexception[org.elasticsearch.common.blobstore.immutableblobcontainer]; ",    "status": 500 } 

any ideas on how start troubleshooting this? information in logs is:

[2015-07-13 16:20:40,519][warn ][repositories             ] [app1050-ela-dacq] failed create repository [s3][elasticsearch -d] org.elasticsearch.common.inject.creationexception: guice creation errors:  1) error injecting constructor, java.lang.noclassdeffounderror: org/elasticsearch/common/blobstore/immutableblobcontainer   @ org.elasticsearch.repositories.s3.s3repository.<init>(unknown source)   while locating org.elasticsearch.repositories.s3.s3repository   while locating org.elasticsearch.repositories.repository  1 error         @ org.elasticsearch.common.inject.internal.errors.throwcreationexceptioniferrorsexist(errors.java:344)         @ org.elasticsearch.common.inject.injectorbuilder.injectdynamically(injectorbuilder.java:178)         @ org.elasticsearch.common.inject.injectorbuilder.build(injectorbuilder.java:110)         @ org.elasticsearch.common.inject.injectorimpl.createchildinjector(injectorimpl.java:131)         @ org.elasticsearch.common.inject.modulesbuilder.createchildinjector(modulesbuilder.java:69)         @ org.elasticsearch.repositories.repositoriesservice.createrepositoryholder(repositoriesservice.java:409)         @ org.elasticsearch.repositories.repositoriesservice.registerrepository(repositoriesservice.java:373)         @ org.elasticsearch.repositories.repositoriesservice.access$100(repositoriesservice.java:57)         @ org.elasticsearch.repositories.repositoriesservice$1.execute(repositoriesservice.java:112)         @ org.elasticsearch.cluster.service.internalclusterservice$updatetask.run(internalclusterservice.java:374)         @ org.elasticsearch.common.util.concurrent.prioritizedesthreadpoolexecutor$tiebreakingprioritizedrunnable.runandclean(prioritizedesthreadpoolexecutor.java:188)         @ org.elasticsearch.common.util.concurrent.prioritizedesthreadpoolexecutor$tiebreakingprioritizedrunnable.run(prioritizedesthreadpoolexecutor.java:158)         @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1142)         @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:617)         @ java.lang.thread.run(thread.java:745) caused by: java.lang.noclassdeffounderror: org/elasticsearch/common/blobstore/immutableblobcontainer         @ org.elasticsearch.repositories.s3.s3repository.<init>(s3repository.java:124)         @ sun.reflect.nativeconstructoraccessorimpl.newinstance0(native method)         @ sun.reflect.nativeconstructoraccessorimpl.newinstance(nativeconstructoraccessorimpl.java:62)         @ sun.reflect.delegatingconstructoraccessorimpl.newinstance(delegatingconstructoraccessorimpl.java:45)         @ java.lang.reflect.constructor.newinstance(constructor.java:422)         @ org.elasticsearch.common.inject.defaultconstructionproxyfactory$1.newinstance(defaultconstructionproxyfactory.java:54)         @ org.elasticsearch.common.inject.constructorinjector.construct(constructorinjector.java:86)         @ org.elasticsearch.common.inject.constructorbindingimpl$factory.get(constructorbindingimpl.java:98)         @ org.elasticsearch.common.inject.factoryproxy.get(factoryproxy.java:52)         @ org.elasticsearch.common.inject.providertointernalfactoryadapter$1.call(providertointernalfactoryadapter.java:45)         @ org.elasticsearch.common.inject.injectorimpl.callincontext(injectorimpl.java:837)         @ org.elasticsearch.common.inject.providertointernalfactoryadapter.get(providertointernalfactoryadapter.java:42)         @ org.elasticsearch.common.inject.scopes$1$1.get(scopes.java:57)         @ org.elasticsearch.common.inject.internalfactorytoprovideradapter.get(internalfactorytoprovideradapter.java:45)         @ org.elasticsearch.common.inject.injectorbuilder$1.call(injectorbuilder.java:200)         @ org.elasticsearch.common.inject.injectorbuilder$1.call(injectorbuilder.java:193)     @ org.elasticsearch.common.inject.injectorimpl.callincontext(injectorimpl.java:830)     @ org.elasticsearch.common.inject.injectorbuilder.loadeagersingletons(injectorbuilder.java:193) 

note version of elasticsearch i'm using 1.6.0 plugin version 2.6.0. output of command 'java -version' following:

openjdk version "1.8.0_45" openjdk runtime environment (build 1.8.0_45-b13) openjdk 64-bit server vm (build 25.45-b02, mixed mode) 

it turns out version of plugin had been installed 2.2.0 instead of 2.6.0.

the answer tlrx gives in here clue.

it's remember restart elasticsearch after you've updated plugin