| from enum import Enumclass Field(Enum):    CONTENT_KEY = "page_content"    METADATA_KEY = "metadata"    GROUP_KEY = "group_id"    VECTOR = "vector"    # Sparse Vector aims to support full text search    SPARSE_VECTOR = "sparse_vector"    TEXT_KEY = "text"    PRIMARY_KEY = "id"    DOC_ID = "metadata.doc_id"
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