com.fasterxml.jackson.core.JsonGenerationException: Can not write a field name, expecting a value

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Can not write a field name, expecting a value
com.fasterxml.jackson.core.JsonGenerationException: Can not write a field name, expecting a value	at com.fasterxml.jackson.core.JsonGenerator._reportError(JsonGenerator.java:1886)	at com.fasterxml.jackson.core.json.UTF8JsonGenerator.writeFieldName(UTF8JsonGenerator.java:185)	at org.elasticsearch.common.xcontent.json.JsonXContentGenerator.writeFieldName(JsonXContentGenerator.java:159)	at org.elasticsearch.common.xcontent.XContentBuilder.field(XContentBuilder.java:198)	at org.elasticsearch.common.xcontent.XContentBuilder.startObject(XContentBuilder.java:145)	at org.elasticsearch.action.admin.cluster.node.tasks.list.ListTasksResponse.toXContent(ListTasksResponse.java:161)	at org.elasticsearch.common.Strings.toString(Strings.java:901)	at org.elasticsearch.common.Strings.toString(Strings.java:887)	at org.elasticsearch.action.admin.cluster.node.tasks.list.ListTasksResponse.toString(ListTasksResponse.java:208)	at org.elasticsearch.tasks.BisectTests.testToStringNoTask(BisectTests.java:35)	at java.lang.Thread.run(Thread.java:745)