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null value cannot be indexed or searched. When a field is set to
(or an empty array or an array of
null values) it is treated as though that
field has no values.
null_value parameter allows you to replace explicit
null values with
the specified value so that it can be indexed and searched. For instance:
An empty array does not contain an explicit
A query for
null_value needs to be the same datatype as the field. For
long field cannot have a string