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java.lang.NullPointerException: 	at org.elasticsearch.plugin.readonlyrest.acl.RequestContext.toString(RequestContext.java:138)	at java.lang.String.valueOf(String.java:2994)	at java.lang.StringBuilder.append(StringBuilder.java:131)	at org.elasticsearch.plugin.readonlyrest.acl.ACL.check(ACL.java:44)	at org.elasticsearch.plugin.readonlyrest.IndexLevelActionFilter.apply(IndexLevelActionFilter.java:82)	at org.elasticsearch.action.support.ActionFilter$Simple.apply(ActionFilter.java:64)	at org.elasticsearch.action.support.TransportAction$RequestFilterChain.proceed(TransportAction.java:170)	at org.elasticsearch.action.support.TransportAction.execute(TransportAction.java:144)	at org.elasticsearch.action.support.TransportAction.execute(TransportAction.java:85)	at org.elasticsearch.client.node.NodeClient.doExecute(NodeClient.java:58)	at org.elasticsearch.client.support.AbstractClient.execute(AbstractClient.java:359)	at org.elasticsearch.client.FilterClient.doExecute(FilterClient.java:52)	at org.elasticsearch.rest.BaseRestHandler$HeadersAndContextCopyClient.doExecute(BaseRestHandler.java:83)	at org.elasticsearch.client.support.AbstractClient.execute(AbstractClient.java:359)	at org.elasticsearch.client.support.AbstractClient$IndicesAdmin.execute(AbstractClient.java:1226)	at org.elasticsearch.client.support.AbstractClient$IndicesAdmin.stats(AbstractClient.java:1546)	at org.elasticsearch.rest.action.cat.RestShardsAction$1.processResponse(RestShardsAction.java:73)	at org.elasticsearch.rest.action.cat.RestShardsAction$1.processResponse(RestShardsAction.java:68)	at org.elasticsearch.rest.action.support.RestActionListener.onResponse(RestActionListener.java:49)	at org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:89)	at org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:85)	at org.elasticsearch.action.support.TransportAction$ResponseFilterChain.proceed(TransportAction.java:212)	at org.elasticsearch.action.support.ActionFilter$Simple.apply(ActionFilter.java:78)	at org.elasticsearch.action.support.TransportAction$ResponseFilterChain.proceed(TransportAction.java:210)	at org.elasticsearch.action.support.TransportAction$FilteredActionListener.onResponse(TransportAction.java:237)	at org.elasticsearch.action.support.TransportAction$FilteredActionListener.onResponse(TransportAction.java:223)	at org.elasticsearch.action.support.ThreadedActionListener$1.doRun(ThreadedActionListener.java:89)	at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)