langchain/document_loaders/s3_directory.py/S3DirectoryLoader/load
class S3DirectoryLoader:    def load(self) -> List[Document]:
        """Load documents."""
        try:
            import boto3
        except ImportError:
            raise ImportError(
                "Could not import boto3 python package. "
                "Please install it with `pip install boto3`."
            )
        s3 = boto3.resource("s3")
        bucket = s3.Bucket(self.bucket)
        docs = []
        for obj in bucket.objects.filter(Prefix=self.prefix):
            loader = S3FileLoader(self.bucket, obj.key)
            docs.extend(loader.load())
        return docs