This endpoint is used both for adding items to an existing collection, by passing in an existing collection_id, or for creating new collections, by passing an unknown collection_id, which will then be created before being populated with items.

collection_id is an arbitrary string for your convenience. It is recommended that you choose something meaningful such as “support-tickets”, or “articles-headlines” based on the context of your input.

Any item will be automatically associated with a cluster, unless you want to force a creation of a new cluster to accommodate this item, or to manually select the cluster you think is best appropriate.

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