docs: add mapping-transformer report for v3.0.0#318
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Summary
This PR adds documentation for the Mapping Transformer feature introduced in OpenSearch v3.0.0.
Changes
docs/releases/v3.0.0/features/opensearch/mapping-transformer.mddocs/features/opensearch/mapping-transformer.mdFeature Overview
Mapping Transformer is an extensibility feature that allows plugins to intercept and transform index mappings during index creation, mapping updates, and index template operations. The primary use case is the neural-search plugin's semantic field feature.
Key Components
MappingTransformerinterface for plugins to implementMappingTransformerRegistryto collect and apply transformersRelated