ElasticSearch mapping for multiple fields

Question

Currently I am using dynamic template as follows, Here I am applying n-gram analyzer to all the "String" fields. However to improve efficiency I would like to apply n-gram only on specific fields only and not on all String fields.

{
        "template": "*",
        "settings": {
            "analysis": {
                "filter": {
                    "ngram_filter": {
                        "type": "ngram",
                        "min_gram": 1,
                        "max_gram": 25
                    }
                },
                "analyzer": {
                    "case_insensitive": {
                        "tokenizer": "whitespace",
                        "filter": [
                            "ngram_filter",
                            "lowercase"
                        ]
                    },
                    "search_analyzer": {
                        "type": "custom",
                        "tokenizer": "whitespace",
                        "filter": "lowercase"
                    }
                }
            }
        },
        "mappings": {
            "my_type": {
                "dynamic_templates": [
                    {
                        "strings": {
                            "match_mapping_type": "string",
                            "mapping": {
                                "type": "string",
                                "fields": {
                                    "keyword": {
                                        "type": "keyword",
                                        "ignore_above": 256
                                    }
                                },
                                "analyzer": "case_insensitive",
                                "search_analyzer": "search_analyzer"
                            }
                        }
                    }
                ]
            }
        }
    }

I have a payload like this:

{
   "userId":"abc123-pqr180-xyz124-njd212",
   "email" : "[email protected]",
   "name"  : "somename",
   .
   .
   20 more fields
}

Now I want to apply n-gram only for "email" and "userid". How can we do this ?

Is it conceivable for you to rename the email and name fields? — Val
– Val, Commented Jun 22, 2017 at 3:37
Thanks for reply Val ! , No, I can't rename those fields. In worst case scenario I am ok to specify mapping for each field i.e no dynamic mapping — SSG
– SSG, Commented Jun 22, 2017 at 3:46
The thing is you can use another parameter called match in which you can give a name pattern to which the template should be applied, but it doesn't take an array and email and name have no prefix/suffix in common. — Val
– Val, Commented Jun 22, 2017 at 3:47
of course, simply drop your dynamic_templates and use the proper mapping for each of your fields. Another way to do this is to duplicate the dynamic template for the two fields email and name — Val
– Val, Commented Jun 22, 2017 at 4:13

Val · Accepted Answer · 2017-06-22 04:15:57Z

Since you cannot rename the fields I suggest the following solution, i.e. to duplicate the dynamic template for the name and email fields.

{
        "template": "*",
        "settings": {
            "analysis": {
                "filter": {
                    "ngram_filter": {
                        "type": "ngram",
                        "min_gram": 1,
                        "max_gram": 25
                    }
                },
                "analyzer": {
                    "case_insensitive": {
                        "tokenizer": "whitespace",
                        "filter": [
                            "ngram_filter",
                            "lowercase"
                        ]
                    },
                    "search_analyzer": {
                        "type": "custom",
                        "tokenizer": "whitespace",
                        "filter": "lowercase"
                    }
                }
            }
        },
        "mappings": {
            "my_type": {
                "dynamic_templates": [
                    {
                        "names": {
                            "match_mapping_type": "string",
                            "match": "name",
                            "mapping": {
                                "type": "string",
                                "fields": {
                                    "keyword": {
                                        "type": "keyword",
                                        "ignore_above": 256
                                    }
                                },
                                "analyzer": "case_insensitive",
                                "search_analyzer": "search_analyzer"
                            }
                        }
                    },
                    {
                        "emails": {
                            "match_mapping_type": "string",
                            "match": "email",
                            "mapping": {
                                "type": "string",
                                "fields": {
                                    "keyword": {
                                        "type": "keyword",
                                        "ignore_above": 256
                                    }
                                },
                                "analyzer": "case_insensitive",
                                "search_analyzer": "search_analyzer"
                            }
                        }
                    }
                ]
            }
        }
    }

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