Elasticsearch: Find values with and without whitespaces

You need to use edge_ngram along with char_filter, to achieve your use case

Adding a working example

Index Mapping:

{  "settings": {    "analysis": {      "analyzer": {        "my_analyzer": {          "tokenizer": "my_tokenizer",          "char_filter": [            "replace_whitespace"          ]        }      },      "tokenizer": {        "my_tokenizer": {          "type": "edge_ngram",          "min_gram": 2,          "max_gram": 10,          "token_chars": [            "letter",            "digit"          ]        }      },      "char_filter": {        "replace_whitespace": {          "type": "mapping",          "mappings": [            "\\u0020=>"          ]        }      }    }  },  "mappings": {    "properties": {      "articlenumbers": {        "type": "text",        "fields": {          "analyzed": {            "type": "text",            "analyzer": "my_analyzer"          }        }      }    }  }}

Index Data:

{  "articlenumbers": "AB 987 g567 323"}

Search Query:

{  "query": {    "multi_match": {      "query": "AB987g",      "fields": [        "articlenumbers",        "articlenumbers.analyzed"      ]    }  }}

Search Result:

"hits": [      {        "_index": "65936531",        "_type": "_doc",        "_id": "1",        "_score": 1.4384104,        "_source": {          "articlenumbers": "AB 987 g567 323"        }      }    ]