Substring does not match with in a string

Elastic Stack Elasticsearch
1

I am working on search functionality using the Elasticsearch, I need to show result in dropdown if string or substring is match.
right now query result be like
if I type in input box test
so result is

test-load-1
test-load-2
test-load-3
test-load-4
test-load-5
test-load-6

but if I type load
in that case I am getting no results

my ES query ls like below

{
    "aggregations": {
        "myagg": {
            "aggregations": {
                "mymaxscore": {
                    "max": {
                        "script": {
                            "source": "_score"
                        }
                    }
                }
            },
            "terms": {
                "field": "name",
                "order": [
                    {
                        "mymaxscore": "desc"
                    }
                ],
                "size": 100
            }
        }
    },
    "query": {
        "bool": {
            "filter": {
                "bool": {
                    "should": {
                        "terms": {
                            "exists": [
                                "true"
                            ]
                        }
                    }
                }
            },
            "must": {
                "match": {
                    "name.engram": {
                        "operator": "or",
                        "query": "load"
                    }
                }
            },
            "should": [
                {
                    "match": {
                        "name.engram": {
                            "operator": "and",
                            "query": "load"
                        }
                    }
                },
                {
                    "term": {
                        "name.lower": {
                            "boost": 100,
                            "value": "load"
                        }
                    }
                },
                {
                    "prefix": {
                        "name.lower": {
                            "boost": 100,
                            "value": "load"
                        }
                    }
                }
            ]
        }
    },
    "size": 100
}
2

Hi!

Give a example your mapping.

3

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