The ContentHandler base class extracts data for certain fields (text, source_text, text_bytes) but I don't see field definitions for these in getFieldsForSearchIndex.
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These fields don't have any specific definition since they are very dependent on the engine, and I haven't found the way to define them in a generic way (at least yet). For now we can just assume they always exist and are texts, or for text_bytes number. I'll think about it and maybe have some generic definition for them later.