Algolia counts operations on replica indices a little differently than with primary indices.

The following replica operations don’t count:

• Propagating data updates from a primary index to a replica index (which happens automatically).
• Propagating settings updates from a primary index to a replica index (via the forwardToReplicas parameter).

However, we count the following operations:

• Updating settings directly on a replica, which counts as one operation.
• Adding a synonym or a Rule directly to a replica, which counts as one operation.

Additional Resources:

For Indexing Operations: How does Algolia count indexing operations?

For InstantSearch Operations: How does Algolia count InstantSearch operations?

For Refinement Operations: How does Algolia count refinement operations?

For Maximum Queries Per Second: How does Algolia calculate the Maximum QPS (Queries Per Second)?