Elasticsearch completion suggester context for nested fields - elasticsearch

Question

I'm working on simple search app with completion feature.
I need to somehow secure those suggestions so I figured out that simplest way to do so would be to add context to completion suggester. My problem is that I don't know how to use suggester context in nested fields.
This is how my mapping looks like, very simple, just 3 fields and one as nested.
curl-XPUT'http: //localhost: 9200/cr/_mapping/agreement_index'-d'{
"agreement_index": {
"properties": {
"agreement_name": {
"type": "string",
"fields": {
"suggest": {
"type": "completion",
"analyzer": "simple",
"payloads": false,
"preserve_separators": true,
"preserve_position_increments": true,
"max_input_length": 50,
"context": {
"permitted": {
"type": "category",
"path": "permitted",
"default": []
}
}
}
}
},
"permitted": {
"type": "integer"
},
"team": {
"type": "nested",
"dynamic": "false",
"properties": {
"email": {
"type": "string",
"fields": {
"raw": {
"type": "string",
"index": "not_analyzed"
},
"suggest": {
"type": "completion",
"analyzer": "simple",
"payloads": false,
"preserve_separators": true,
"preserve_position_increments": true,
"max_input_length": 50,
"context": {
"permitted": {
"type": "category",
"path": "permitted",
"default": []
}
}
}
}
},
"name": {
"type": "string",
"fields": {
"raw": {
"type": "string",
"index": "not_analyzed"
},
"suggest": {
"type": "completion",
"analyzer": "simple",
"payloads": false,
"preserve_separators": true,
"preserve_position_increments": true,
"max_input_length": 50,
"context": {
"permitted": {
"type": "category",
"path": "permitted",
"default": []
}
}
}
}
},
"permitted": {
"type": "integer"
}
}
}
}
}
}'
During indexing documents like this:
curl-XPUT'http: //localhost: 9200/cr/agreement_index/1'-d'{
"agreement_name": "QWERTY",
"team": [{
"name": "Tomasz Sobkowiak",
"permitted": ["2"],
"email": "tsobkowiak#fake.com"
}],
"permitted": ["2"]
}'
I got below error:
{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"one or more prefixes needed"}],"type":"illegal_argument_exception","reason":"one or more prefixes needed"},"status":400}
After removing context from completion suggesters in nested fields everything work fine.
So my question is, how I can use context suggesters in nested fields with path pointed to field in outer document? Is something like that even possible?

Answer 1

The problem is in your mapping. Default can not be left empty. You need to to assign at least one default value in the mapping for context suggester.
"context": {
"permitted": {
"type": "category",
"path": "permitted",
"default": [] // <-- defaults can not be empty, provide at least one default integer value
}
}
The value of the default field is used, when ever no specific is
provided for the certain context. Note that a context is defined by at
least one value.
Also, In the document you are trying to index, you are using string in permitted whereas it is mapped as Integer.
"permitted": ["2"] // <-- change this to "permitted":[2]