Elasticsearch: Field level custom scores in text searches -


i started exploring elasticsearch. need find approach specifying custom scores @ field level. example:

i have collection named blog documents have following format:

{      "_id": "1736hst26672829",      "name": "learning regular expressions basics",      "author": "john lee",      "summery": "here summery.",      "body": "content of blog." }

if search text 'xyz' in collection result should reflect following score criteria

  • match in field 'name' has priority 1.
  • match in author field has 2nd priority.
  • match in summery has 3rd priority.
  • match in body has least priority.

i need top 10 results on basis of above criteria.

:

scoring in elasticsearch extremely customizable, following applies query time based custom scoring. there various other scoring options, index, in mapping (and applied every query), on filters or facets, using boosts or custom scoring.

while custom score query powerful solution, here docs various custom scoring methods read on.

the following simplest methods apply custom scoring in query time, although suggest read on custom score query.

  "query": {       "filtered": {           "query":                "bool": {                   "must": [                      {"multi_match": {                               "fields": [                                   "name^4",                                   "author^3",                                   "summery^2",                                   "body^1"                               ],                               "query": "xyz",                               "operator": "and",                               "type": "cross_fields",                               "analyzer": "standard"                       }}                   ]                  }           }       }   }

for people search answer wish use nest, bellow same query using nest. use ^ character boost specific fields or use onfieldswithboost give fields custom scoring, , query sorted score.

var query = "xyz";  //add field names string in lower camelcase es default. list<string> searchin = new list<string(new string[] {"_id","name","author","summery","body"});  .type("blogtype") .sortdescending("_score") .query(     q => q.multimatch(         t => t.onfields(             searchin             .select(qs => qs == "name" ? "name^4" : qs)             .select(qs => qs == "author" ? "author^3" : qs)             .select(qs => qs == "summery" ? "summery^2" : qs)             .select(qs => qs == "body" ? "body" : qs)             )         .query(query)     ) )

if have correct (default) mapping in es (c# object es indexed json object), can use following within onfields:

t => t.onfieldswithboost(qs => qs.add(entry => entry.name, 4.0)                            .add(entry => entry.author, 3.0)                            .add(entry => entry.summary, 2.0)                            .add(entry => entry.body, 1.0))

Comments

Post a Comment

Popular posts from this blog

c# - Validate object ID from GET to POST -

i have method allows user access comment have made on site. have post method lets them update comment. my normal solution send entire comment model through, let them update it, update on database when post back. involve sending commentid through in hiddenfor , can manipulated. how can verify commentid sent in get method same i'm getting in post , not able alter comment wish? how can verify commentid sent in method same i'm getting in post? basically have validate following things in post - user logged-in user. authenticated users post comments. commentid in post , should valid commentid , should present in database. userid associated logged-in user should same userid associated comment . comment should contain userid column, can check @ time of update. to make sure update happens comment has been sent in get - hold commentid in session , in post action compare commentid value in session .
Read more

node.js - Custom Model Validator SailsJS -

when using custom model validator checks record within model. return within spread doesn't seem end control flow. //post.js model /** * custom validator **/ types: { isuservalid: function(user_id) { var promise = require('bluebird'); promise.all([ user.findone({id: user_id}) ]) .spread(function(user) { console.log(user); if (user === null || user === undefined) { console.log('failed'); return false; }else{ console.log('passed'); return true; } }); } }, my response standard validation failed response. { "error": "e_validation", "status": 400, "summary": "1 attribute invalid", "model": "post", "invalidattributes": { "owner": [ { "rule": "isuservalid", ...
Read more

php - Find a regex to take part of Email -

i have following emails need extract part from: bestellnummer xxx: 1 von xxx, 1er pack ------------- anfang der nachricht ------------- foo bar baz foo bar baz // <<<<< need text here ------------- ende der nachricht ------------- ------------- anfang der nachricht ------------- foo bar baz foo bar baz ------------- ende der nachricht ------------- there 0 unlimited occurences of ------------- anfang der nachricht ------------- ------------- ende der nachricht ------------- and i'm able extract first part regex: $re = "/------------- .*? -------------.?(.*?).?------------- .*? -------------/s"; but, i'm quite new on learning regex, i'm pretty sure there must better regex extract part (foo bar baz foo bar baz) of text between ------------- anfang der nachricht ------------- ------------- ende der nachricht ------------- as can in different languages, i'm using .? to match between hyphens. i...
Read more