# Edge\_ngram results **URL:** \ **Category:** Elasticsearch\ **Created:** [October 1, 2014, 10:24am UTC](https://discuss.elastic.co/t/edge-ngram-results/20022 "2014-10-01T10:24:17Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Lee\_Gee](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/lee_gee/32/1217_2.png) [@Lee\_Gee](https://discuss.elastic.co/u/Lee_Gee)\ **Post date:** [October 1, 2014, 10:24am UTC](https://discuss.elastic.co/t/edge-ngram-results/20022/1 "2014-10-01T10:24:17Z")
I have an ElasticSearch string field configured for autocomplete like this: ``` autocomplete_analyzer: type: custom tokenizer: whitespace filter: [ lowercase, asciifolding, ending_synonym, name_synonyms, ``` autocomplete\_filter ] ``` autocomplete_filter: type: edge_ngram min_gram: 1 max_gram: 20 token_chars: [letter, digit, whitespace, punctuation, symbol] search_analyzer: type: custom tokenizer: whitespace filter: [ lowercase, asciifolding, standard, name_synonyms, ``` ending\_synonym ] I have a record where the field contains 'S XYZ', and lots of other records where the field contains other words beginning S. I do not understand why, when I search for 'S XYZ', it is not the first result. Could someone please explain ? Many thanks in anticipation lee -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/218280b1-2c9c-42db-854d-62d1c8de8862%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/218280b1-2c9c-42db-854d-62d1c8de8862%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![jpountz](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jpountz/32/45836_2.png) [@jpountz](https://discuss.elastic.co/u/jpountz)\ **Post date:** [October 1, 2014, 10:55pm UTC](https://discuss.elastic.co/t/edge-ngram-results/20022/2 "2014-10-01T22:55:14Z")
Maybe you can enable explanations to see how scores are computed and what the difference is between these records? > **[Elasticsearch Platform — Find real-time answers at scale](https://www.elastic.co)** > > Power insights and outcomes with the Elasticsearch Platform and AI. See into your data and find answers that matter with enterprise solutions designed to help you build, observe, and protect. Try Elasticsearch free today. On Wed, Oct 1, 2014 at 12:24 PM, Lee Gee [leegee@gmail.com](mailto:leegee@gmail.com) wrote: > I have an Elasticsearch string field configured for autocomplete like this: > > ``` > autocomplete_analyzer: > type: custom > tokenizer: whitespace > filter: [ lowercase, asciifolding, ending_synonym, > > ``` > > name\_synonyms, autocomplete\_filter ] > > ``` > autocomplete_filter: > type: edge_ngram > min_gram: 1 > max_gram: 20 > token_chars: [letter, digit, whitespace, punctuation, symbol] > > search_analyzer: > type: custom > tokenizer: whitespace > filter: [ lowercase, asciifolding, standard, name_synonyms, > > ``` > > ending\_synonym ] > > I have a record where the field contains 'S XYZ', and lots of other > records where the field contains other words beginning S. > > I do not understand why, when I search for 'S XYZ', it is not the first > result. > > Could someone please explain ? > > Many thanks in anticipation > lee > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/218280b1-2c9c-42db-854d-62d1c8de8862%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/218280b1-2c9c-42db-854d-62d1c8de8862%40googlegroups.com) > [https://groups.google.com/d/msgid/elasticsearch/218280b1-2c9c-42db-854d-62d1c8de8862%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/218280b1-2c9c-42db-854d-62d1c8de8862%40googlegroups.com?utm_medium=email&utm_source=footer) > . > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- Adrien Grand -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAL6Z4j6C5nvV-rzqWGQ%3DWxHYSyzX34t6qQXshomfh26p4nK\_aA%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAL6Z4j6C5nvV-rzqWGQ%3DWxHYSyzX34t6qQXshomfh26p4nK_aA%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![Lee\_Gee](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/lee_gee/32/1217_2.png) [@Lee\_Gee](https://discuss.elastic.co/u/Lee_Gee)\ **Post date:** [October 2, 2014, 8:41am UTC](https://discuss.elastic.co/t/edge-ngram-results/20022/3 "2014-10-02T08:41:55Z")
'explain' shows only two differences between the two results: Hit on 'S' vs. hit on 'DqWjDCcsh S' - idf(docFreq=1, maxDocs=1) vs. idf(docFreq=10, maxDocs=10) - fieldNorm(doc=0) vs. fieldNorm(doc=9) My possibly flawed understanding is that IDF is the inverse document frequency of the search term across the whole index — what confuses me is that these are results for the same term in the same index, so shouldn't the IDF be the same...? tia lee On Wednesday, October 1, 2014 11:24:17 AM UTC+1, Lee Gee wrote: > I have an Elasticsearch string field configured for autocomplete like this: > > ``` > autocomplete_analyzer: > type: custom > tokenizer: whitespace > filter: [ lowercase, asciifolding, ending_synonym, > > ``` > > name\_synonyms, autocomplete\_filter ] > > ``` > autocomplete_filter: > type: edge_ngram > min_gram: 1 > max_gram: 20 > token_chars: [letter, digit, whitespace, punctuation, symbol] > > search_analyzer: > type: custom > tokenizer: whitespace > filter: [ lowercase, asciifolding, standard, name_synonyms, > > ``` > > ending\_synonym ] > > I have a record where the field contains 'S XYZ', and lots of other > records where the field contains other words beginning S. > > I do not understand why, when I search for 'S XYZ', it is not the first > result. > > Could someone please explain ? > > Many thanks in anticipation > lee -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/681ebe12-7cfa-4ed6-a045-ad287545d4eb%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/681ebe12-7cfa-4ed6-a045-ad287545d4eb%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![Lee\_Gee](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/lee_gee/32/1217_2.png) [@Lee\_Gee](https://discuss.elastic.co/u/Lee_Gee)\ **Post date:** [October 2, 2014, 9:13am UTC](https://discuss.elastic.co/t/edge-ngram-results/20022/4 "2014-10-02T09:13:59Z")
The problem was that my test script did not pause between creating/populating the index, and searching on it. Even though there are very few documents (10), Elasticsearch still needs a second or two to catch its breath and mop its brow before it is ready to search. Now to find a way to rank shorter strings higher than longer ones.... but that's another question.... thanks Lee On Wednesday, October 1, 2014 11:24:17 AM UTC+1, Lee Gee wrote: > I have an Elasticsearch string field configured for autocomplete like this: > > ``` > autocomplete_analyzer: > type: custom > tokenizer: whitespace > filter: [ lowercase, asciifolding, ending_synonym, > > ``` > > name\_synonyms, autocomplete\_filter ] > > ``` > autocomplete_filter: > type: edge_ngram > min_gram: 1 > max_gram: 20 > token_chars: [letter, digit, whitespace, punctuation, symbol] > > search_analyzer: > type: custom > tokenizer: whitespace > filter: [ lowercase, asciifolding, standard, name_synonyms, > > ``` > > ending\_synonym ] > > I have a record where the field contains 'S XYZ', and lots of other > records where the field contains other words beginning S. > > I do not understand why, when I search for 'S XYZ', it is not the first > result. > > Could someone please explain ? > > Many thanks in anticipation > lee -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/c43961cb-224a-4b17-a03e-fc44926a05ec%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/c43961cb-224a-4b17-a03e-fc44926a05ec%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**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, 12:58am UTC](https://discuss.elastic.co/t/edge-ngram-results/20022/5 "2017-07-06T00:58:44Z")