Search on particular field gives no results

Elastic Stack Elasticsearch
1

I have a document indexed whose structure is as follows:

{
"_index": "yelp",
"_type": "user",
"_id": "ABC",
"_score": 1,
"_source": {
"yelping_since": "2007-07",
"votes": {},
"review_count": 1798,
"name": "TEST_USER",
"user_id": "123",
"friends": [],
"fans": 89,
"average_stars": 3.48,
"type": "user",
"compliments": {},
"elite": []
}
}

When I search with ES POST/_search

{
"fields" : ["name", "user_id"],
"query" : {
"term" : { "_id" : "ABC" }
}
}

One document is returned.

But when I search for document using a specific field like "user_id", no documents are fetched.

{
"fields" : ["name", "user_id"],
"query" : {
"term" : { "user_id" : "123" }
}
}

Any idea why? I have not used any custom mapping while indexing the documents. Any help is appreciated.

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