HTTP API: search finished

[JinHai-CN]

What problem does this PR solve?

curl --request GET --url localhost:23820/databases/default/tables/my_table/docs --header 'accept: application/json' --header 'content-type: application/json' --data '
{
    "output":
    [
        "num",
        "body",
        "vec"
    ],
    "fusion": 
    {
        "method": "rrf",
        "match":
        {
            "fields": "body", 
            "query": "bloom",
            "operator": "topn=3"
        },
        "knn":
        {
            "fields": "vec",
            "query_vector": [3.0, 2.8, 2.7, 3.1],
            "element_type": "float",
            "top_k": 3,
            "metric_type": "inner_product"
        }
    }
} '

{
"error_code":0,
"output":[{"body":"Office for Harmful Blooms","num":"2","vec":"4.000000, 4.200000, 4.300000, 4.500000"},{"body":"unnecessary and harmful","num":"1","vec":"1.000000, 1.200000, 0.800000, 0.900000"}]
}

Issue link:#779

Type of change

• New Feature (non-breaking change which adds functionality)