Sitecore Azure rebuild index:The request is invalid. Details: index.fields[0].name

Question

I am using Sitecore 8.2 update 3 and Azure search service in our application. I am able to rebuild the master index successfully but when i am rebuilding web index, it will get stuck in middle and never completes. I get below error in logs:

WARN Crawler : AddRecursive DoItemAdd failed - {D9B152A2-0503-45EF-ACE0-AAFE117120A7} Exception: System.AggregateException Message: One or more errors occurred. Source: mscorlib at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions) at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken) at System.Threading.Tasks.Parallel.ForWorker[TLocal](Int32 fromInclusive, Int32 toExclusive, ParallelOptions parallelOptions, Action1 body, Action2 bodyWithState, Func4 bodyWithLocal, Func1 localInit, Action1 localFinally) at System.Threading.Tasks.Parallel.ForEachWorker[TSource,TLocal](IEnumerable1 source, ParallelOptions parallelOptions, Action1 body, Action2 bodyWithState, Action3 bodyWithStateAndIndex, Func4 bodyWithStateAndLocal, Func5 bodyWithEverything, Func1 localInit, Action1 localFinally) at System.Threading.Tasks.Parallel.ForEach[TSource](IEnumerable1 source, Action1 body) at Sitecore.ContentSearch.Azure.Http.CompositeSearchService.PostDocuments(ICloudBatch batch) at Sitecore.ContentSearch.Azure.CloudSearchUpdateContext.Commit() at Sitecore.ContentSearch.CommitPolicyExecutor.IndexModified(IProviderUpdateContext context, Object document, IndexOperation operation) at Sitecore.ContentSearch.Azure.CloudSearchUpdateContext.AddDocument(Object itemToAdd, IExecutionContext[] executionContexts) at Sitecore.ContentSearch.Azure.CloudSearchIndexOperations.Add(IIndexable indexable, IProviderUpdateContext context, ProviderIndexConfiguration indexConfiguration) at Sitecore.ContentSearch.SitecoreItemCrawler.DoAdd(IProviderUpdateContext context, SitecoreIndexableItem indexable) at Sitecore.ContentSearch.HierarchicalDataCrawler1.CrawlItem(T indexable, IProviderUpdateContext context, CrawlState`1 state)

Nested Exception

Exception: Sitecore.ContentSearch.Azure.Http.Exceptions.BadRequestException Message: Error in the request URI, headers, or body Source: Sitecore.ContentSearch.Azure at Sitecore.ContentSearch.Azure.Http.SearchServiceClient.EnsureSuccessStatusCode(HttpResponseMessage response) at Sitecore.ContentSearch.Azure.Http.SearchServiceClient.UpdateIndex(IEnumerable1 fields) at Sitecore.ContentSearch.Azure.Schema.SearchServiceSchemaSynchronizer.SyncRemoteService(IEnumerable1 sourceSchema, IEnumerable1 incomingSchema) at Sitecore.ContentSearch.Azure.Schema.SearchServiceSchemaSynchronizer.<>c__DisplayClass11_0.<EnsureIsInSync>b__0() at Sitecore.ContentSearch.Azure.Utils.Retryer.RetryPolicy.Execute(Action action) at Sitecore.ContentSearch.Azure.Http.SearchService.PostDocumentsImpl(ICloudBatch batch) at Sitecore.ContentSearch.Azure.Http.SearchService.PostDocuments(ICloudBatch batch) at Sitecore.ContentSearch.Azure.Http.CompositeSearchService.<>c__DisplayClass11_0.<PostDocuments>b__0(ISearchService searchService) at System.Threading.Tasks.Parallel.<>c__DisplayClass17_01.b__1() at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask) at System.Threading.Tasks.Task.<>c__DisplayClass176_0.>b__0(Object )

Nested Exception

Exception: >Sitecore.ContentSearch.Azure.Http.Exceptions.AzureSearchServiceRESTCallException Message: {"error":{"code":"","message":"The request is invalid. Details: >index.fields[0].name : The name field is required.\r\n"}}

Answer 1

I got this exception while trying to rebuild sitecore web index. This issue arises when sitecore tries to index some item whose template or field doesn't exist in the web database.

I got this issue resolved by republishing the templates as some templates were not published properly earlier.