Update field to null

I'm java client for elastic search.. I need to update my field(type:date) date to Null.
For example
exp_date : "2017-01-01T18-15-12-345Z"

null is not something indexable in lucene. In elasticsearch, finding a null in the json of a document being indexed means "replace with the null_value". null_value is essentially a default value you can specify in the mapping for a field. This is explained a bit better in the definitive guide: https://www.elastic.co/guide/en/elasticsearch/guide/current/_dealing_with_null_values.html

thanks Ryan

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