Agregar nuevo campo en el índice Kibana existente usando Spark Java

String json1 = "{\"reason\" : \"business\",\"airport\" : \"SFO\"}";  
String json2 = "{\"participants\" : 5,\"airport\" : \"OTP\"}";

JavaSparkContext jsc = ...
JavaRDD<String> stringRDD = jsc.parallelize(ImmutableList.of(json1, json2)); 
JavaEsSpark.saveJsonToEs(stringRDD, "spark/json-trips");             
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