Help with Ngrams - also index non-Ngrams

Elastic Stack Elasticsearch
1

Hi

We are trying to use ngrams in our index. Currently we have this
configuration:

                "ngram":{
                    "tokenizer":"whitespace",
                    "filter":[
                        "standard",
                        "lowercase",
                        "ngram",
                        "catenate_words"
                    ]
                },

....
"ngram":{
"type":"nGram",
"min_gram":3,
"max_gram":50
},

When looking at a term like "mc donalds" we see that the "mc" part is not
put into the index. Anybody have an idea of how to configure the index so
that we get "mc" as well as "don", "ald" etc (without changing the min_gram
setting)?

/Per

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2

I believe it's min_gram:3 setting which prevents any terms shorter than 3
characters to be an ngram

On Thursday, February 28, 2013 10:22:15 AM UTC-5, Per Ekman wrote:

Hi

We are trying to use ngrams in our index. Currently we have this
configuration:

                "ngram":{
                    "tokenizer":"whitespace",
                    "filter":[
                        "standard",
                        "lowercase",
                        "ngram",
                        "catenate_words"
                    ]
                },

....
"ngram":{
"type":"nGram",
"min_gram":3,
"max_gram":50
},

When looking at a term like "mc donalds" we see that the "mc" part is not
put into the index. Anybody have an idea of how to configure the index so
that we get "mc" as well as "don", "ald" etc (without changing the min_gram
setting)?

/Per

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3

I am afraid you can't do this at this point. Terms shorter that the
min-gram size will always be dropped (swallowed).

simon

On Thursday, February 28, 2013 4:22:15 PM UTC+1, Per Ekman wrote:

Hi

We are trying to use ngrams in our index. Currently we have this
configuration:

                "ngram":{
                    "tokenizer":"whitespace",
                    "filter":[
                        "standard",
                        "lowercase",
                        "ngram",
                        "catenate_words"
                    ]
                },

....
"ngram":{
"type":"nGram",
"min_gram":3,
"max_gram":50
},

When looking at a term like "mc donalds" we see that the "mc" part is not
put into the index. Anybody have an idea of how to configure the index so
that we get "mc" as well as "don", "ald" etc (without changing the min_gram
setting)?

/Per

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4

alright, I guess we'll have to use the combo-plugin in some way to do it

On Fri, Mar 1, 2013 at 12:05 PM, simonw
simon.willnauer@elasticsearch.comwrote:

I am afraid you can't do this at this point. Terms shorter that the
min-gram size will always be dropped (swallowed).

simon

On Thursday, February 28, 2013 4:22:15 PM UTC+1, Per Ekman wrote:

Hi

We are trying to use ngrams in our index. Currently we have this
configuration:

                "ngram":{
                    "tokenizer":"whitespace",
                    "filter":[
                        "standard",
                        "lowercase",
                        "ngram",
                        "catenate_words"
                    ]
                },

....
"ngram":{
"type":"nGram",
"min_gram":3,
"max_gram":50
},

When looking at a term like "mc donalds" we see that the "mc" part is not
put into the index. Anybody have an idea of how to configure the index so
that we get "mc" as well as "don", "ald" etc (without changing the min_gram
setting)?

/Per

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