DynaRank Plugin provides a feature for Dynamic Ranking at a search time. You can change top N documents in the search result with your re-ordering algorithm. Elasticsearch has rescoring, but DynaRank is different as below:
- DynaRank's reranking is executed on requested node only, not on each shard.
- DynaRank uses a script language for reranking.
Please file an issue.
$ $ES_HOME/bin/elasticsearch-plugin install org.codelibs:elasticsearch-dynarank:7.16.0
Create "sample" index:
$ COUNT=1;while [ $COUNT -le 100 ] ; do curl -XPOST 'localhost:9200/sample/_doc/' -d "{\"message\":\"Hello $COUNT\",\"counter\":$COUNT}";COUNT=`expr $COUNT + 1`; done
100 documents are inserted. You can see 10 documents by an ascending order of "counter" field:
$ curl -XPOST "http://127.0.0.1:9200/sample/_search" -d'
{
"query": {
"match_all": {}
},
"sort": [
{
"counter": {
"order": "asc"
}
}
]
}'
DynaRank plugin is enabled if your re-order script is set to the target index:
$ curl -s -XPUT -H 'Content-Type: application/json' "localhost:9200/sample/_settings" -d"
{
\"index\" : {
\"dynarank\":{
\"script_sort\":{
\"lang\": \"painless\",
\"script\": \"def l=new ArrayList();for(def h:searchHits){l.add(h);}return l.stream().sorted((s1,s2)->s2.getSourceAsMap().get('counter')-s1.getSourceAsMap().get('counter')).toArray(n->new org.elasticsearch.search.SearchHit[n])\"
},
\"reorder_size\": 5
}
}
}"
This setting sorts top 5 documents (5 is given by reorder_size) by a descending order of "counter" field, and others are by an ascending order.
Set an empty value to index.dynarank.script_sort.script:
$ curl -s -XPUT -H 'Content-Type: application/json' "localhost:9200/sample/_settings" -d"
{
\"index\" : {
\"dynarank\":{
\"script_sort\":{
\"script\": \"\"
}
}
}
}"
DynaRank plugin provides a sort feature for a diversity problem. The sort script is dynarank_diversity_sort. The configuration is below:
curl -XPUT -H 'Content-Type: application/json' 'localhost:9200/sample/_settings' -d '
{
"index" : {
"dynarank":{
"script_sort":{
"lang":"dynarank_diversity_sort",
"params":{
"bucket_factory": "standard",
"diversity_fields":["filedname1", "filedname2"],
"diversity_thresholds":[0.95, 1]
}
},
"reorder_size":100
}
}
}'
bucket_factory is bucket type. use minhash type field for sort, specify "minhash".(default: standard)
diversity_fields is fields for a diversity.
diversity_thresholds is a threshold for a similarity of each document.
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