How do I increment the weight of a completion suggest field? - elasticsearch

Question

I am making a completion suggester. I would like to increment the weight of some of the indexed docs by incrementing them. I have:
POST /tester/
{
"mappings": {
"song": {
"properties": {
"suggest": {
"type": "completion",
"analyzer": "simple",
"search_analyzer" : "simple",
"payloads": true,
"preserve_separators": true,
"preserve_position_increments": true,
"max_input_length": 100
}
}
}
}
}
// Index a doc
PUT tester/song/1
{
"name" : "Nevermind",
"suggest" : {
"input": [ "Nevermind", "Nirvana" ],
"output": "Nirvana - Nevermind",
"payload" : { "artistId" : 2321 },
"weight" : 1
}
}
// Increment the weight
POST /tester/song/1
{
"script" : {
"inline": "ctx._source.suggest.weight += 1"
}
}
// The result of GET /tester
{
"_index": "tester",
"_type": "song",
"_id": "1",
"_score": 1,
"_source": {
"script": {
"inline": "ctx._source.suggest.weight += 1"
}
}
}
Rather than incrementing the weight it rewrites the document. What am I doing wrong here?

Answer 1

First by adding these lines to your configuration you should enable dynamic scripting:
script.inline: true
script.indexed: true
Then you need to use _update endpoint to update:
POST 'localhost:9200/tester/song/1/_update' -d '
{
"script" : {
"inline": "ctx._source.suggest.weight += 1"
}
}'
Check:https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-update.html#_scripted_updates