Analyzer alias problem

document attempted

curl -XPUT 'http://sd:5100/indexx/typey/idz' -d '
{
"_analyzer":"all_analyzer",
"title":"a title"
}
'

elasticsearch.yml

http:
    port: 5100-5199

gateway:
    type: local
    recover_after_nodes: 1

index:
    number_of_shards : 1
    number_of_replicas : 0

    store:
        niofs:
            memory:
                enabled: false
    analysis:
        analyzer:
            all_analyzer:
                # try uncommenting the following line to see the problem
                #alias: [index_all_analyzer, search_all_analyzer]
                type: custom
                tokenizer: whitespace

log output

Exception in thread "elasticsearch[Briquette]clusterService#updateTask-pool-5-thread-1" java.lang.NullPointerException
        at org.apache.lucene.analysis.Analyzer.close(Analyzer.java:141)
        at org.elasticsearch.index.analysis.NamedAnalyzer.close(NamedAnalyzer.java:93)
        at org.elasticsearch.index.analysis.AnalysisService.close(AnalysisService.java:163)
        at org.elasticsearch.indices.InternalIndicesService.deleteIndex(InternalIndicesService.java:285)
        at org.elasticsearch.indices.InternalIndicesService.cleanIndex(InternalIndicesService.java:249)
        at org.elasticsearch.indices.cluster.IndicesClusterStateService.applyCleanedIndices(IndicesClusterStateService.java:137)
        at org.elasticsearch.indices.cluster.IndicesClusterStateService.clusterChanged(IndicesClusterStateService.java:126)
        at org.elasticsearch.cluster.service.InternalClusterService$2.run(InternalClusterService.java:214)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)                      
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)                          
        at java.lang.Thread.run(Thread.java:619)