My task is to sort documents in ascending and descending order, but 'number' must remain of the keyword type. I read other posts on a similar topic, and tried to add an 'number' of type integer, but I didn't succeed and the index crashes. I am attaching the current configuration in the esMapping.js file.

Is there a way to fix this esMapping.js file so that ascending and descending sorting works?

"settings": {
    "analysis": {
        "analyzer": {
            "document_number_analyzer": {
                "type": "custom",
                "tokenizer": "document_number_tokenizer"
            }
        },
        "tokenizer": {
            "document_number_tokenizer": {
                "type": "pattern",
                "pattern": "-0*([1-9][0-9]*)\/",
                "group": 1
            }
        },
    }
}

Mapping:

"number": {
            "type": "keyword",
            "copy_to": [
                "_summary"
            ],
            "fields": {
                "sequenceNumber": {
                    "type": "text",
                    "analyzer": "document_number_analyzer"
                }
            }
        }

EDIT:

Error after using integer sub-field to sort documents:

022-05-18 11:33:32.5830 [ERROR] ESIndexerLogger Failed to commit bulk. Errors:
index returned 400 _index: adama_gen_ro_importdocument _type: _doc _id: 4c616067-4beb-4484-83cc-7eb9d36eb175 _version: 0 error: Type: mapper_parsing_exception Reason: "failed to parse field [number.sequenceNumber] of type [integer] in document with id '4c616067-4beb-4484-83cc-7eb9d36eb175'. Preview of field's value: 'BS-000011/2022'" CausedBy: "Type: number_format_exception Reason: "For input string: "BS-000011/2022"""