# What is required for partial match to work? **URL:** \ **Category:** Elasticsearch\ **Created:** [July 4, 2011, 7:54am UTC](https://discuss.elastic.co/t/what-is-required-for-partial-match-to-work/4764 "2011-07-04T07:54:30Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Raul\_Jr\_Martinez](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/raul_jr_martinez/32/1286_2.png) [@Raul\_Jr\_Martinez](https://discuss.elastic.co/u/Raul_Jr_Martinez)\ **Post date:** [July 4, 2011, 7:54am UTC](https://discuss.elastic.co/t/what-is-required-for-partial-match-to-work/4764/1 "2011-07-04T07:54:30Z")
Hello, I'm pretty much new to ElasticSearch and my question is on partial match and is somehow related to an older post and figured out that the old thread didn't contain answers I was looking for: [http://groups.google.com/a/elasticsearch.com/group/users/browse\_thread/thread/57f551b0897bf55c/be5276d04f0ba1f5?lnk=gst&q=Partial+Search#be5276d04f0ba1f5](http://groups.google.com/a/elasticsearch.com/group/users/browse_thread/thread/57f551b0897bf55c/be5276d04f0ba1f5?lnk=gst&q=Partial+Search#be5276d04f0ba1f5) Anyway, I have one document with title containing the word "ULTRALIGHT". I want to make sure that when I search for "ULTRA" or "LIGHT", the said document should be included in the result set. I am using query\_string when searching. How do I go about making sure that I get this result? Should I be using Fuzzy or FLT? Thanks, Raul ---
**Author:** ![Paul\_Loy](https://avatars.discourse-cdn.com/v4/letter/p/ad7895/32.png) [@Paul\_Loy](https://discuss.elastic.co/u/Paul_Loy)\ **Post date:** [July 4, 2011, 10:02am UTC](https://discuss.elastic.co/t/what-is-required-for-partial-match-to-work/4764/2 "2011-07-04T10:02:14Z")
Depends on what your data is going to be like. Are these real words, or usernames? You can use n-gram, but be careful as depending on your values for n you can get lots of matches that may seem unrelated. I use n-gram for usernames. On Mon, Jul 4, 2011 at 8:54 AM, rmartinez [juneym@gmail.com](mailto:juneym@gmail.com) wrote: > Hello, > > I'm pretty much new to Elasticsearch and my question is on partial > match and is somehow related to an older post and figured out that the > old thread didn't contain answers I was looking for: > > [http://groups.google.com/a/elasticsearch.com/group/users/browse\_thread/thread/57f551b0897bf55c/be5276d04f0ba1f5?lnk=gst&q=Partial+Search#be5276d04f0ba1f5](http://groups.google.com/a/elasticsearch.com/group/users/browse_thread/thread/57f551b0897bf55c/be5276d04f0ba1f5?lnk=gst&q=Partial+Search#be5276d04f0ba1f5) > > Anyway, I have one document with title containing the word > "ULTRALIGHT". I want to make sure that when I search for "ULTRA" or > "LIGHT", the said document should be included in the result set. > > I am using query\_string when searching. How do I go about making sure > that I get this result? Should I be using Fuzzy or FLT? > > Thanks, > > Raul ## -- Paul Loy [paul@keteracel.com](mailto:paul@keteracel.com) [http://uk.linkedin.com/in/paulloy](http://uk.linkedin.com/in/paulloy) ---
**Author:** ![Raul\_Jr\_Martinez](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/raul_jr_martinez/32/1286_2.png) [@Raul\_Jr\_Martinez](https://discuss.elastic.co/u/Raul_Jr_Martinez)\ **Post date:** [July 5, 2011, 3:32pm UTC](https://discuss.elastic.co/t/what-is-required-for-partial-match-to-work/4764/3 "2011-07-05T15:32:14Z")
Hi Paul, The is in the form of Articles and free-form text like classified ads. I will try N-gram and see if it works for me. By the way, I used FLT but it seems that I need to actually investigate why some "unrelated" documents are matching... maybe it's too fuzzy 🙂 Regards, Raul On Jul 4, 6:02 pm, Paul Loy [ketera...@gmail.com](mailto:ketera...@gmail.com) wrote: > Depends on what your data is going to be like. Are these real words, or > usernames? > > You can use n-gram, but be careful as depending on your values for n you can > get lots of matches that may seem unrelated. I use n-gram for usernames. > > On Mon, Jul 4, 2011 at 8:54 AM, rmartinez [jun...@gmail.com](mailto:jun...@gmail.com) wrote: > > > Hello, > > > I'm pretty much new to Elasticsearch and my question is on partial > > match and is somehow related to an older post and figured out that the > > old thread didn't contain answers I was looking for: > > > [http://groups.google.com/a/elasticsearch.com/group/users/browse\_threa](http://groups.google.com/a/elasticsearch.com/group/users/browse_threa)... > > > Anyway, I have one document with title containing the word > > "ULTRALIGHT". I want to make sure that when I search for "ULTRA" or > > "LIGHT", the said document should be included in the result set. > > > I am using query\_string when searching. How do I go about making sure > > that I get this result? Should I be using Fuzzy or FLT? > > > Thanks, > > > Raul > > ## -- > > Paul Loy > p...@keteracel.comhttp://uk.linkedin.com/in/paulloy ---
**Author:** ![Paul\_Loy](https://avatars.discourse-cdn.com/v4/letter/p/ad7895/32.png) [@Paul\_Loy](https://discuss.elastic.co/u/Paul_Loy)\ **Post date:** [July 6, 2011, 9:31am UTC](https://discuss.elastic.co/t/what-is-required-for-partial-match-to-work/4764/4 "2011-07-06T09:31:06Z")
N-gram will probably be worse for matching unrelated docs... On Tue, Jul 5, 2011 at 4:32 PM, rmartinez [juneym@gmail.com](mailto:juneym@gmail.com) wrote: > Hi Paul, > > The is in the form of Articles and free-form text like classified ads. > > I will try N-gram and see if it works for me. By the way, I used FLT > but it seems that I need to actually investigate why some "unrelated" > documents are matching... maybe it's too fuzzy 🙂 > > Regards, > Raul > > On Jul 4, 6:02 pm, Paul Loy [ketera...@gmail.com](mailto:ketera...@gmail.com) wrote: > > > Depends on what your data is going to be like. Are these real words, or > > usernames? > > > > You can use n-gram, but be careful as depending on your values for n you > > can > > get lots of matches that may seem unrelated. I use n-gram for usernames. > > > > On Mon, Jul 4, 2011 at 8:54 AM, rmartinez [jun...@gmail.com](mailto:jun...@gmail.com) wrote: > > > > > Hello, > > > > > I'm pretty much new to Elasticsearch and my question is on partial > > > match and is somehow related to an older post and figured out that the > > > old thread didn't contain answers I was looking for: > > > > > [http://groups.google.com/a/elasticsearch.com/group/users/browse\_threa](http://groups.google.com/a/elasticsearch.com/group/users/browse_threa). > > > .. > > > > > Anyway, I have one document with title containing the word > > > "ULTRALIGHT". I want to make sure that when I search for "ULTRA" or > > > "LIGHT", the said document should be included in the result set. > > > > > I am using query\_string when searching. How do I go about making sure > > > that I get this result? Should I be using Fuzzy or FLT? > > > > > Thanks, > > > > > Raul > > > > ## -- > > > > Paul Loy > > p...@keteracel.comhttp://uk.linkedin.com/in/paulloy ## -- Paul Loy [paul@keteracel.com](mailto:paul@keteracel.com) [http://uk.linkedin.com/in/paulloy](http://uk.linkedin.com/in/paulloy) ---
**Author:** ![Clinton\_Gormley](https://avatars.discourse-cdn.com/v4/letter/c/50afbb/32.png) [@Clinton\_Gormley](https://discuss.elastic.co/u/Clinton_Gormley)\ **Post date:** [July 6, 2011, 9:51am UTC](https://discuss.elastic.co/t/what-is-required-for-partial-match-to-work/4764/5 "2011-07-06T09:51:01Z")
On Wed, 2011-07-06 at 10:31 +0100, Paul Loy wrote: > N-gram will probably be worse for matching unrelated docs... Ngrams should usually only be used in the index\_analyzer, not the search\_analyzer, to improve result relevancy. For instance: We index the text "apple" with an edge ngram analyzer, and get: - a,ap,app,appl,apple When we analyze the search text, we can do it with ngrams or without ngrams. This is what you would see: The user wants to search for "application", and starts typing: ``` no-ngram ngram -------------------------------------------- a match match ap match match app match match appl match match appli no match match* applic no match match* ``` Those last two results show why you usually don't want to use the ngram version at search time. To achieve this, when you specify the mapping for a field, you can do: { my\_content: { type: "string", index\_analyzer: "my\_ngram\_analyzer", search\_analyzer: "default" }} clint ---
**Author:** ![Raul\_Jr\_Martinez](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/raul_jr_martinez/32/1286_2.png) [@Raul\_Jr\_Martinez](https://discuss.elastic.co/u/Raul_Jr_Martinez)\ **Post date:** [July 8, 2011, 12:32am UTC](https://discuss.elastic.co/t/what-is-required-for-partial-match-to-work/4764/6 "2011-07-08T00:32:31Z")
THis works for me. > { content: { type: "string", index\_analyzer: "ascAnalyzer1", search\_analyzer: "default" }} On Jul 6, 5:51 pm, Clinton Gormley [clin...@iannounce.co.uk](mailto:clin...@iannounce.co.uk) wrote: > On Wed, 2011-07-06 at 10:31 +0100, Paul Loy wrote: > > > N-gram will probably be worse for matching unrelated docs... > > Ngrams should usually only be used in the index\_analyzer, not the > search\_analyzer, to improve result relevancy. > > For instance: > > We index the text "apple" with an edge ngram analyzer, and get: > > - a,ap,app,appl,apple > > When we analyze the search text, we can do it with ngrams or without > ngrams. This is what you would see: > > The user wants to search for "application", and starts typing: > > ``` > no-ngram ngram > -------------------------------------------- > a match match > ap match match > app match match > appl match match > appli no match match* > applic no match match* > > ``` > > Those last two results show why you usually don't want to use the ngram > version at search time. > > To achieve this, when you specify the mapping for a field, you can do: > > { my\_content: { > type: "string", > index\_analyzer: "my\_ngram\_analyzer", > search\_analyzer: "default" > }} > > clint ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 4:01am UTC](https://discuss.elastic.co/t/what-is-required-for-partial-match-to-work/4764/7 "2017-07-06T04:01:22Z")