ab65a57d70
This PR implements recursive mapping merging for composable index templates. When creating an index, we perform the following: * Add each component template mapping in order, merging each one in after the last. * Merge in the index template mappings (if present). * Merge in the mappings on the index request itself (if present). Some principles: * All 'structural' changes are disallowed (but everything else is fine). An object mapper can never be changed between `type: object` and `type: nested`. A field mapper can never be changed to an object mapper, and vice versa. * Generally, each section is merged recursively. This includes `object` mappings, as well as root options like `dynamic_templates` and `meta`. Once we reach 'leaf components' like field definitions, they always overwrite an existing one instead of being merged. Relates to #53101. |
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