- from enum import Enum
 - 
 - 
 - class 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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