Add comprehensive migration documentation section#3341

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dataroaring wants to merge 12 commits intomasterfrom

feature/migration-documentation-consolidation

Commits on Feb 11, 2026

Add comprehensive migration documentation section

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Update ES nested type mapping from JSON to VARIANT

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Update all JSON type mappings to VARIANT

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Remove how-to instructions, keep principles and type mappings

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Remove recommendation labels from migration options

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Add ES feature compatibility tables (VARIANT, search function)

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Add built-in Streaming Job option for MySQL and PostgreSQL migration

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Add built-in Streaming Job option for MySQL and PostgreSQL migration

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Add Streaming Job to migration overview

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Simplify migration paths table to single Sync Modes column

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Align migration method order for PostgreSQL and MySQL

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Remove vague Migration Window planning principle

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