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java.lang.StackOverflowError at java.util.Collections$UnmodifiableMap.get(Collections.java:1454)[?:1.8.0_73] at org.elasticsearch.common.xcontent.XContentBuilder.unknownValue(XContentBuilder.java:799)[elasticsearch-5.0.0-beta1.jar:5.0.0-beta1] at org.elasticsearch.common.xcontent.XContentBuilder.map(XContentBuilder.java:865)[elasticsearch-5.0.0-beta1.jar:5.0.0-beta1] at org.elasticsearch.common.xcontent.XContentBuilder.unknownValue(XContentBuilder.java:806)[elasticsearch-5.0.0-beta1.jar:5.0.0-beta1] at org.elasticsearch.common.xcontent.XContentBuilder.map(XContentBuilder.java:865)[elasticsearch-5.0.0-beta1.jar:5.0.0-beta1] at org.elasticsearch.common.xcontent.XContentBuilder.unknownValue(XContentBuilder.java:806)[elasticsearch-5.0.0-beta1.jar:5.0.0-beta1] at org.elasticsearch.common.xcontent.XContentBuilder.map(XContentBuilder.java:865)[elasticsearch-5.0.0-beta1.jar:5.0.0-beta1] at org.elasticsearch.common.xcontent.XContentBuilder.unknownValue(XContentBuilder.java:806)[elasticsearch-5.0.0-beta1.jar:5.0.0-beta1] at org.elasticsearch.common.xcontent.XContentBuilder.map(XContentBuilder.java:865)[elasticsearch-5.0.0-beta1.jar:5.0.0-beta1] at org.elasticsearch.common.xcontent.XContentBuilder.unknownValue(XContentBuilder.java:806)[elasticsearch-5.0.0-beta1.jar:5.0.0-beta1] at org.elasticsearch.common.xcontent.XContentBuilder.map(XContentBuilder.java:865)[elasticsearch-5.0.0-beta1.jar:5.0.0-beta1]