Matching the stored values and queries in Elastic Search

Question

I have a field called that is inside a nested field "name" that is a "Keyword" in elastic search.

Name field contains 2 values.

1. Jagannathan Rajagopalan
2. Rajagopalan.

If I query "Rajagopalan", I should get only the item #2. If I query the complete Jagannathan Rajagopalan, I should get #1.

How do I achieve it?

Answer 1

You need to use the term query which is used for exact search. Added a working example according to your use-case.

Index mapping

{
    "mappings": {
        "properties": {
            "name": {
                "type": "nested",
                "properties": {
                    "keyword": {
                        "type": "keyword"
                    }
                }
            }
        }
    }
}

Index sample docs

{
    "name" : {
        "keyword" : "Jagannathan Rajagopalan"
    }
}

And another doc

{
    "name" : {
        "keyword" : "Jagannathan"
    }
}

And search query

{
    "query": {
        "nested": {
            "path": "name",
            "query": {
                "bool": {
                    "must": [
                        {
                            "match": {
                                "name.keyword": "Jagannathan Rajagopalan"
                            }
                        }
                    ]
                }
            }
        }
    }
}

Search result

   "hits": [
            {
                "_index": "key",
                "_type": "_doc",
                "_id": "2",
                "_score": 0.6931471,
                "_source": {
                    "name": {
                        "keyword": "Jagannathan Rajagopalan"
                    }
                }
            }
        ]