@Bonyfus Martin Thanks for reaching out to Microsoft Q&A, apologize for any inconvenience caused on this.
As mentioned in this documentation, Billing is based on capacity (SUs) and the costs of running premium features, such as AI enrichment, Semantic ranking, and Private endpoints.
There is no meter on the number of queries, query responses, or documents ingested, although service limits do apply at each tier.
You can refer to this documentation for more information about plans and manage costs in Azure cognitive Search.
Feel free to reach back to me if you have any further questions on this.