Fields containing only whitespace are assigned null values by EsInputFormat in a JSON document

[Suchindra Agarwal]

I am using EsInputFormat on EC2 to query data from Elasticsearch. 

Example document:

{
    "feature_key": {
        "brand_name": "  ",
        "product_type": "HOME",
        "language_tag": "ja_JP"
    },
    "stats": {
        "1_count": 0,
        "2_count": 1,
        "3_count": 1,
    },
}

The brand_name field contains the IDEOGRAPHIC WHITESPACE character 
(whitespace in Japanese). I have disabled analyze on the feature_key field 
and all its sub-fields. After I finished indexing all documents, if I query 
through the rest end point, the document gets returned as is.

But using the EsInputFormat to query the document returns null value in the 
brand_name field.


{
    "feature_key": {
        "brand_name": null,
        "product_type": "HOME",
        "language_tag": "ja_JP"
    },
    "stats": {
        "1_count": 0,
        "2_count": 1,
        "3_count": 1,
    },
}

How can change this behavior? I do not want the _source/document to be 
modified in any way.

Thanks,
Suchin

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