Hi,

I would like to add 3 dedicated master only nodes to my cluster. I'd like to transition my existing master/data nodes to be data node only.  However, the first step I took was to try adding a master only node to my cluster (master : true , data : false). I'm seeing the node start and join the cluster as expected, but when the node is initializing I keep seeing the warning shown below in the logs. It references the path.repo setting which we haven't set on any of the other nodes. I don't see this error on the other nodes when I restart them so I'm just wondering what this is? Can this be ignored if we don't care about snapshots? We are running ES 2.4.1.  
[2018-02-14 01:22:19,678][WARN ][repositories.fs          ] [es4] The specified location [/snapshots] should start with a repository path specified by the path.repo setting, but the path.repo setting was not set on this node
[2018-02-14 01:22:19,684][WARN ][repositories             ] [es4] failed to create repository [fs][test_backup]
org.elasticsearch.common.inject.CreationException: Guice creation errors:

1) Error injecting constructor, RepositoryException[[test_backup] location [/snapshots] doesn't match any of the locations specified by path.repo because this setting is empty]
  at org.elasticsearch.repositories.fs.FsRepository.<init>(Unknown Source)
  while locating org.elasticsearch.repositories.fs.FsRepository
  while locating org.elasticsearch.repositories.Repository

1 error
        at org.elasticsearch.common.inject.internal.Errors.throwCreationExceptionIfErrorsExist(Errors.java:360)
        at org.elasticsearch.common.inject.InjectorBuilder.injectDynamically(InjectorBuilder.java:178)
        at org.elasticsearch.common.inject.InjectorBuilder.build(InjectorBuilder.java:110)
        at org.elasticsearch.common.inject.InjectorImpl.createChildInjector(InjectorImpl.java:154)
        at org.elasticsearch.common.inject.ModulesBuilder.createChildInjector(ModulesBuilder.java:55)
        at org.elasticsearch.repositories.RepositoriesService.createRepositoryHolder(RepositoriesService.java:404)
        at org.elasticsearch.repositories.RepositoriesService.clusterChanged(RepositoriesService.java:299)
        at org.elasticsearch.cluster.service.InternalClusterService.runTasksForExecutor(InternalClusterService.java:610)
        at org.elasticsearch.cluster.service.InternalClusterService$UpdateTask.run(InternalClusterService.java:772)
        at org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.runAndClean(PrioritizedEsThreadPoolExecutor.java:231)
        at org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.run(PrioritizedEsThreadPoolExecutor.java:194)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)

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