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Is this like schema-less? How do you do indexing for individual log fields and stuff?

They put log attributes into map and then index that map. See https://www.highlight.io/blog/how-we-built-logging-with-clic... (search for CREATE TABLE).

You get structured attribute search without a schema with Highlight. More in our docs: https://www.highlight.io/docs/general/product-features/loggi...