Incorrect behaviour of fuzzing parameters with completion suggester

Elastic Stack Elasticsearch
1

I use fuzzing in my quries to completion suggester. It seems like min_length and fuzziness parameters of the query can't agree between each other.

The parameters are described in the docs

Example 1: "min_length": 5, "fuzziness": "AUTO:5,8"

  • query: conte-
    expected: query length is 6, we're expecting 1 correction (dash to be removed)
    result: contemporary is suggested, everything's ok :white_check_mark:

  • query: contempo--
    expected: query length is 10, we're expecting 2 corrections
    result: nothing is suggested, incorrect behaviour :x:

Example 2: "min_length": 1, "fuzziness": "AUTO:2,5"

  • query: co-
    expected: query length is 3, we're expecting 1 correction
    result: contemporary and cheese are suggested, we have 2 corrections in the cheese case :x:

  • query: contempo--
    expected: query length is 10, we're expecting 2 corrections
    result: contemporary is suggested, everything's ok :white_check_mark:

The problem is reproducible with ES 8.6.2 and 8.8.2.

My configuration is as follows. Mapping:

{
    "mappings": {
        "properties": {
            "query": {
                "type": "completion",
                "analyzer": "autocomplete_analyzer",
                "search_analyzer": "autocomplete_search_analyzer"
            },
        }
    }
}

Query:

{
    "suggest": {
        "text-suggest": {
        "prefix": "conte-",
        "completion": {
            "field": "query",
            "fuzzy": {
                "fuzziness": "AUTO:5,8",
                "min_length": 5,
                "unicode_aware": True
            },
            "size": 4
            }
        }
    }
}

Could anyone help with the issue? Probably this needs a bug confirmation. I would appreciate any help!