Yeap, that help, thanks Doug! :-) On Thu, Apr 23, 2015 at 10:56 PM, Doug Turnbull <dturnb...@opensourceconnections.com> wrote: > A term in a purely technical sense is an entry in the inverted index. > Technically it is a very low-level entity. > > For example, if you tokenized and analyzed doc1: "Dougie Turnbull" using the > English analyzer (which stems words to root forms, lowercases, etc), you'd > get an inverted index that looks somethinglike: > > doug > document: 1 > position 0 > freq 1 > turnbul > document: 1 > position 1 > freq 1 > > A "term query" therefore directly accesses terms. Its a bit of a low-level > concern. You'd have to query "doug" directly even though the original text > said "dougie". > > However, loosely people use the word "search term" to mean words people > enter into a search bar. > > "string" is a concept that just reflects the text being analyzed. IE "Dougie > Turnbull". This type is at the Elasticsearch level, and is a peer for > integer, floats, doubles etc. This type dicates how Elasticsearch > understands the value passed from the client and converts it to the inverted > index structure above. A string type will be analyzed, picked apart into > terms, etc based on the associated analyzer. Other types like numeric types > have other low-level magic that helps convert them to the inverted index > data structure. > > Hope that helps, > -Doug > > > On Thu, Apr 23, 2015 at 10:42 AM, Jason Wee <peich...@gmail.com> wrote: >> >> Can anybody explain what is the different between term and string in >> elasticsearch context? >> >> When we index using default mapping >> (http://www.elastic.co/guide/en/elasticsearch/reference/current/indices-put-mapping.html), >> the default type is string. >> >> But when we query, we use the word term >> (http://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-term-query.html) >> instead of string? >> >> I google lucene documentation, the term is define as >> >> A query is broken up into terms and operators. There are two types of >> terms: Single Terms and Phrases. A Single Term is a single word such as >> "test" or "hello". A Phrase is a group of words surrounded by double quotes >> such as "hello dolly". >> >> but it has no mentioned on string. >> >> >> https://lucene.apache.org/core/4_10_3/queryparser/org/apache/lucene/queryparser/classic/package-summary.html#package_description >> >> Thank you. >> >> Jason >> >> -- >> 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+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/elasticsearch/df898132-f7f8-4476-8a81-21e3891dfb1a%40googlegroups.com. >> For more options, visit https://groups.google.com/d/optout. > > > > > -- > Doug Turnbull | Search Relevance Consultant | OpenSource Connections, LLC | > 240.476.9983 | http://www.opensourceconnections.com > Author: Taming Search from Manning Publications > This e-mail and all contents, including attachments, is considered to be > Company Confidential unless explicitly stated otherwise, regardless of > whether attachments are marked as such. > > -- > 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+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/elasticsearch/CALG6HL8RtomqZ3tWxB%2BEN2q_JHZmppGwzVw0HfPWJjTmzVNXCw%40mail.gmail.com. > > For more options, visit https://groups.google.com/d/optout.
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