The indexing policy determines how the metadata query engine indexes objects. Each object has its own indexing policy setting that indicates whether the metadata query engine should index custom metadata for that object. This setting is part of the object metadata.
Every object has an individual indexing policy setting defined as part of its system metadata. HCP ignores this setting for an object when custom metadata indexing is disabled for its namespace. However, metadata query API requests can always use the individual indexing policy setting as a namespace search criterion. Additionally, third-party applications can use this setting for their own purposes.