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import boto3
from pydantic import BaseModel
from typing import List
import json

class BusinessUnitSearchResultItem(BaseModel):
    lookup_value: str
    linked_records: List[str]

class BusinessUnitSearchResults(BaseModel):
    features: List[BusinessUnitSearchResultItem]

class BusinessUnitSearchParameters(BaseModel):
    query: str
    fields: List[str] = ["lookup_value"]
    sort: str = '_score desc'
    size: int = 10

class BusinessUnitCloudSearchClient:
    def __init__(self, domain_endpoint: str):
        self.client = boto3.client('cloudsearchdomain', endpoint_url=domain_endpoint)

    def search(self, params: BusinessUnitSearchParameters) -> BusinessUnitSearchResults:
        response = self.client.search(
            query=params.query,
            queryParser='simple',
            sort=params.sort,
            size=params.size,
            q_options=json.dumps({"fields": params.fields})
        )
        search_results = []
        for hit in response['hits']['hit']:
            search_results.append(BusinessUnitSearchResultItem(
                lookup_value=hit['fields'].get('lookup_value', [''])[0],
                linked_records=hit['fields'].get('linked_records', [])
            ))

        return BusinessUnitSearchResults(
            features=search_results
        )