ElasticSearch Match Phrase Query Not returning expected results

Elastic Stack Elasticsearch
1

I have a document with field: "title1" as: "A380 Familiarization".

When I run this query: the search results are empty. The document is not returned as part of the search query results.

GET index/_search
{
    "from": 0,
    "size": 10,
    "_source":
    [
        "title1"
    ],
    "query":
    {
        "bool":
        {
            "must":
            {
                "bool":
                {
                    "should":
                    [
                        {
                            "multi_match":
                            {
                                "query": "A380 Familiarization",
                                "analyzer": "search_analyzer1",
                                "type": "phrase",
                                "fields":
                                [
                                    "title1"
                                ]
                            }
                        }
                    ]
                }
            }
        }
    },
    "sort":
    [
        {
            "_score": "desc"
        }
    ]
}

The field title1 is indexed using a different analyzer:

  "title1": {
          "type": "text",
          "fields": {
            "raw": {
              "type": "keyword"
            }
          },
          "analyzer": "search_analyzer2"
        }

Here is the definition of search_analyzer2:

"search_analyzer2": {
             "type": "custom",
             "tokenizer": "standard",
             "filter": [
               "icu_folding",
               "word_delimiter_filter",
               "edge_ngram_filter"
             ],
             "char_filter": [
               "html_strip"
             ]
           }

And, here is the definition of search_analyzer1:

  "search_analyzer1": {
             "type": "custom",
             "tokenizer": "standard",
             "filter": [
               "icu_folding"
             ],
             "char_filter": [
               "html_strip"
             ]
           }

When I run analyze command using both the analyzers, there are overalapping tokens. Both return A380 but still the document is not returned.

GET index/_analyze
{
  "analyzer": "search_analyzer1",
  "text": "A380"
}

GET index/_analyze
{
  "analyzer": "search_analyzer2",
  "text": "A380"
}

Please advise why the document is not returned in the search results?

2

What is the output of both _analyze calls?

3

Your search string is not what you showed the analysis for. How is this analyzed using both analyzers? How is the indexed string you are looking to match analyzed?

4

Here is the analyze result for analyzer2:

GET index/_analyze
{
  "analyzer": "search_analyzer2",
  "text": "A380 Familiarization"
}

{
  "tokens": [
    {
      "token": "a",
      "start_offset": 0,
      "end_offset": 4,
      "type": "<ALPHANUM>",
      "position": 0
    },
    {
      "token": "a3",
      "start_offset": 0,
      "end_offset": 4,
      "type": "<ALPHANUM>",
      "position": 0
    },
    {
      "token": "a38",
      "start_offset": 0,
      "end_offset": 4,
      "type": "<ALPHANUM>",
      "position": 0
    },
    {
      "token": "a380",
      "start_offset": 0,
      "end_offset": 4,
      "type": "<ALPHANUM>",
      "position": 0
    },
    {
      "token": "a",
      "start_offset": 0,
      "end_offset": 1,
      "type": "<ALPHANUM>",
      "position": 0
    },
    {
      "token": "3",
      "start_offset": 1,
      "end_offset": 4,
      "type": "<ALPHANUM>",
      "position": 1
    },
    {
      "token": "38",
      "start_offset": 1,
      "end_offset": 4,
      "type": "<ALPHANUM>",
      "position": 1
    },
    {
      "token": "380",
      "start_offset": 1,
      "end_offset": 4,
      "type": "<ALPHANUM>",
      "position": 1
    },
    {
      "token": "f",
      "start_offset": 5,
      "end_offset": 20,
      "type": "<ALPHANUM>",
      "position": 2
    },
    {
      "token": "fa",
      "start_offset": 5,
      "end_offset": 20,
      "type": "<ALPHANUM>",
      "position": 2
    },
    {
      "token": "fam",
      "start_offset": 5,
      "end_offset": 20,
      "type": "<ALPHANUM>",
      "position": 2
    },
    {
      "token": "fami",
      "start_offset": 5,
      "end_offset": 20,
      "type": "<ALPHANUM>",
      "position": 2
    },
    {
      "token": "famil",
      "start_offset": 5,
      "end_offset": 20,
      "type": "<ALPHANUM>",
      "position": 2
    },
    {
      "token": "famili",
      "start_offset": 5,
      "end_offset": 20,
      "type": "<ALPHANUM>",
      "position": 2
    },
    {
      "token": "familia",
      "start_offset": 5,
      "end_offset": 20,
      "type": "<ALPHANUM>",
      "position": 2
    },
    {
      "token": "familiar",
      "start_offset": 5,
      "end_offset": 20,
      "type": "<ALPHANUM>",
      "position": 2
    },
    {
      "token": "familiari",
      "start_offset": 5,
      "end_offset": 20,
      "type": "<ALPHANUM>",
      "position": 2
    },
    {
      "token": "familiariz",
      "start_offset": 5,
      "end_offset": 20,
      "type": "<ALPHANUM>",
      "position": 2
    },
    {
      "token": "familiariza",
      "start_offset": 5,
      "end_offset": 20,
      "type": "<ALPHANUM>",
      "position": 2
    },
    {
      "token": "familiarizat",
      "start_offset": 5,
      "end_offset": 20,
      "type": "<ALPHANUM>",
      "position": 2
    },
    {
      "token": "familiarizati",
      "start_offset": 5,
      "end_offset": 20,
      "type": "<ALPHANUM>",
      "position": 2
    },
    {
      "token": "familiarizatio",
      "start_offset": 5,
      "end_offset": 20,
      "type": "<ALPHANUM>",
      "position": 2
    },
    {
      "token": "familiarization",
      "start_offset": 5,
      "end_offset": 20,
      "type": "<ALPHANUM>",
      "position": 2
    }
  ]
}

And here is the analyze result for analyzer1:

GET index/_analyze
{
  "analyzer": "search_analyzer1",
  "text": "A380 Familiarization"
}

{
  "tokens": [
    {
      "token": "a380",
      "start_offset": 0,
      "end_offset": 4,
      "type": "<ALPHANUM>",
      "position": 0
    },
    {
      "token": "familiarization",
      "start_offset": 5,
      "end_offset": 20,
      "type": "<ALPHANUM>",
      "position": 1
    }
  ]
}
5

What if you remove this line?

"type": "phrase",
6

If I remove the "type": "phrase", I get the search results.
The thing is: I need it to work with type: phrase.
phrase means exact match. I am using exact terms when searching then why the search results are not getting returned?

7

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