Improving documentation about es.read.fields.include, and fixing a related bug (#1822) #1834
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The documentation for es.read.fields.include left room for confusion. Also the bevaior was different between spark 1,
spark 2, and spark 3 -- setting "es.read.fields.include" to part of a hierarchy caused a NullPointerException in spark 1
and spark 2.
Closes #1784