Sitecore Azure Rebuild index error : sending too many requests

Question

I am using Sitecore 8.2 update 3 with Azure search service(Basic) in our application. While rebuilding the index,we get below error.

7980 08:34:38 INFO Schema synchronization failed Exception: Sitecore.ContentSearch.Azure.Http.Exceptions.AzureSearchServiceRESTCallException Message: Error while search service call, see details in message Source: Sitecore.ContentSearch.Azure at Sitecore.ContentSearch.Azure.Http.SearchServiceClient.EnsureSuccessStatusCode(HttpResponseMessage response) at Sitecore.ContentSearch.Azure.Http.SearchServiceClient.GetIndex() at Sitecore.ContentSearch.Azure.Schema.SearchServiceSchemaSynchronizer.RefreshLocalSchema() at Sitecore.ContentSearch.Azure.Http.SearchService.SyncSchema(Object state)

Nested Exception

Exception: Sitecore.ContentSearch.Azure.Http.Exceptions.AzureSearchServiceRESTCallException Message: {"error":{"code":"","message":"You are sending too many requests. Please try again later."}}

I went through the Azure documentation for search-limits-quota-capacity but i don't find maximum number of requests we can make to Azure. https://docs.microsoft.com/en-us/azure/search/search-limits-quotas-capacity

Number of fields is less than 1000 and Batch size is set to 100 in our application.

How can i check the number of service requests we have made ?

Answer 1

I often encounter this error when there are too many indexes in the Azure search service. I use Postman to 1) get a list of the indexes and 2) to delete indexes which are not needed (our setup means each developer has their own indexes in Azure search and we often hit the limits!).

Answer 2

We changed the azure search version in the connection string.

Requests before:

https://MY_SEARCH_SERVICE.search.windows.net/indexes/sitecore-web-index?api-version=2015-02-28-preview

Requests after:

https://MY_SEARCH_SERVICE.search.windows.net/indexes/sitecore-web-index?api-version=2016-09-01

If you are using API version 2015-02-28-Preview, see if you can change that to a higher version.

Compatibility Table: https://kb.sitecore.net/articles/549969

Answer 3

We recently encountered the same issue on sitecore 9.2 version. It seems that there is a sitecore bug when SwitchOnRebuild feature is used affecting sitecore versions 9.0.2 upwards and it was fixed on 9.3.

After applying the fix downloaded from https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB0983274 we are no longer getting the error.