java.lang.IllegalArgumentException: The number of object passed must be even but was [1] at org.elasticsearch.action.index.IndexRequest.source(IndexRequest.java:451)

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The number of object passed must be even but was [1] at org.elasticsearch.action.index.IndexRequest.source(IndexRequest.java:451)
java.lang.IllegalArgumentException: The number of object passed must be even but was [1] at org.elasticsearch.action.index.IndexRequest.source(IndexRequest.java:451)
at elastic.elasti.App.lambda$0(App.java:55)
at java.util.ArrayList.forEach(ArrayList.java:1249)
at elastic.elasti.App.indexExampleData(App.java:53)
at elastic.elasti.App.main(App.java:45)

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