Error: replica indexName cannot be equal to the primary when using replica

[david.choi]

I am doing a sorted query and so switched the main index to the relevant replica. I can see the replica has records and the searchable attributes are set along with the ranking and facets I need. These settings are already in the dashboard. But I am getting the error shown.
I have a screenshot of the index settings and you’ll notice that the ranking has some custom fields that were auto inserted (I only added the view field).
I also tried removing the replicas in the setSettings. The error goes away but it returns no results.

// this is how I init the index

constructor(appId: string, apiKey: string, indexName: string, env: string, sortingReplica?: SortingReplicas) {
        this.requestOptions = { headers: { "x-algolia-application-id": appId } };
        this.client = algoliasearch(appId, apiKey);  
        if (sortingReplica) {
            this.mainIndexName = sortingReplica === SortingReplicas.DocsByModified
                ? env.toLocaleLowerCase() + "_" + SortingReplicas.DocsByModified
                : env.toLocaleLowerCase() + "_" + SortingReplicas.DocsByViewed
        } else {
            this.mainIndexName = indexName;
        }
        
        this.index = this.client.initIndex(this.mainIndexName);
        this.sortingReplica = sortingReplica;       

        this.index.setSettings({
            attributesForFaceting: [
                'searchable(parentSection)',
                'filterOnly(group)'
            ],
            replicas: [
                sortingReplica === SortingReplicas.DocsByModified
                ? env.toLocaleLowerCase() + "_" + SortingReplicas.DocsByModified
                : env.toLocaleLowerCase() + "_" + SortingReplicas.DocsByViewed
            ]
        });
    }

// this is my index settings

[chuck.meyer]

Double check your naming logic. For some reason your ending up with a replica that matches the name of the primary index. Each replica needs a unique name (typically this a unique prefix).

Can you dump the raw JSON your using for the configuration to verify the replica names aren’t colliding with the primary?