Elasticsearch custom sorting / adding filter clauses scores -


i have simple documents set:

{   id : 1,   book_ids : [2,3],   collection_ids : ['a','b'] }, {   id : 2,   book_ids : [1,2] }

if run filter query, match both documents:

{     bool: {         filter: [             {                 bool: {                     should: [                         {                             bool: {                                 must_not: {                                     exists: {                                         field: 'book_ids'                                     }                                 }                             }                         },                         {                             bool: {                                 filter: {                                     term: {                                         book_ids: 2                                     }                                 }                             }                         }                     ]                 }             },             {                 bool: {                     should: [                         {                             bool: {                                 must_not: {                                     exists: {                                         field: 'collection_ids'                                     }                                 }                             }                         },                         {                             bool: {                                 filter: {                                     term: {                                         collection_ids: 'a'                                     }                                 }                             }                         }                     ]                 }             }         ]     } }

the thing want sort these documents, , first 1 (id: 1) returned first because matched both book_ids value , collection_ids values provided.

a simple sort clause 1 not working:

[   'book_ids',   'collection_ids' ]

because return first document 2 due book_ids array first value.

edit: simplified example of problem facing, has n such clauses in should clause. there order between clauses, tried reflect sort snippet: results matching first clause (book_ids) should appear before results matching second clause (collection_ids). looking kind of sql sort operation take account matching value of field array. viable option might assign decreasing constant_scores each term clause, according expected sort order, , es have sum sub-scores compute final score. cannot figure out how or if possible.

bonus question: there way elasticsearch return kind of new document matching values? here expect response above filter query:

{   id : 1,   book_ids : [2],   collection_ids : ['a'] }, {   id : 2,   book_ids : [2] }

i think you're right constant score idea. think can this: 

{   query: {     bool: {       must: [         {           bool: {             should: [               {                 bool: {                   must_not: {                     exists: {                       field: 'book_ids'                     }                   }                 }               },               {                 constant_score: {                   filter: {                     term: {                       book_ids: 2                     }                   },                   boost: 100                 }               }             ]           }         },         {           bool: {             should: [               {                 bool: {                   must_not: {                     exists: {                       field: 'collection_ids'                     }                   }                 }               },               {                 constant_score: {                   filter: {                     term: {                       collection_ids: 'a'                     }                   },                   boost: 50                 }               }             ]           }         }       ]     }     } }

i think thing missing using constant score, top level query needs must, not filter. (there's no scoring filters, scores 0.)

an alternative put filter inside function_score query (but leave filter), , compute score want (https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-function-score-query.html)

as bonus question, it's possible if use script field filter , add new field want (https://www.elastic.co/guide/en/elasticsearch/reference/current/search-request-script-fields.html), it's not possible in straightforward way. it's easier , makes more sense filtering after receive result, unless have long lists in values.


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