Index declarations in YAML

Documentation status: reference — see Maturity and evidence.

Indexes are operational artifacts used to accelerate access to data or projections. They must not become the definition of the business concept.

Index syntax depends on the provider and Runtime version. Always document:

• the indexed target;
• the relevant fields or roles;
• whether it is unique;
• the operational reason for the index.

Do not invent a YAML shape that is not present in the grammar of the targeted version.