It seems set up right to me, but I might be missing something.

ExamineSettings.config:

<?xml version="1.0"?>
<Examine>
    <ExamineIndexProviders>
        <providers>
            <add name="InternalIndexer" type="UmbracoExamine.UmbracoContentIndexer, UmbracoExamine" supportUnpublished="true" supportProtected="true" analyzer="Lucene.Net.Analysis.WhitespaceAnalyzer, Lucene.Net" directoryFactory="Examine.LuceneEngine.Directories.SyncTempEnvDirectoryFactory,Examine" />
            <add name="InternalMemberIndexer" type="UmbracoExamine.UmbracoMemberIndexer, UmbracoExamine" supportUnpublished="true" supportProtected="true" analyzer="Lucene.Net.Analysis.Standard.StandardAnalyzer, Lucene.Net" directoryFactory="Examine.LuceneEngine.Directories.SyncTempEnvDirectoryFactory,Examine" />
            <!-- default external indexer, which excludes protected and unpublished pages-->
            <add name="ExternalIndexer" type="UmbracoExamine.UmbracoContentIndexer, UmbracoExamine" directoryFactory="Examine.LuceneEngine.Directories.SyncTempEnvDirectoryFactory,Examine" />
        </providers>
    </ExamineIndexProviders>
    <ExamineSearchProviders defaultProvider="ExternalSearcher">
        <providers>
            <add name="InternalSearcher" type="UmbracoExamine.UmbracoExamineSearcher, UmbracoExamine" analyzer="Lucene.Net.Analysis.WhitespaceAnalyzer, Lucene.Net" directoryFactory="Examine.LuceneEngine.Directories.SyncTempEnvDirectoryFactory,Examine" />
            <add name="ExternalSearcher" type="UmbracoExamine.UmbracoExamineSearcher, UmbracoExamine" enableDefaultEventHandler="true" />
            <add name="InternalMemberSearcher" type="UmbracoExamine.UmbracoExamineSearcher, UmbracoExamine" analyzer="Lucene.Net.Analysis.Standard.StandardAnalyzer, Lucene.Net" directoryFactory="Examine.LuceneEngine.Directories.SyncTempEnvDirectoryFactory,Examine" enableLeadingWildcard="true" />
        </providers>
    </ExamineSearchProviders>
</Examine>

ExamineIndex.config:

<?xml version="1.0"?>
<ExamineLuceneIndexSets>
    <!-- The internal index set used by Umbraco back-office - DO NOT REMOVE -->
    <IndexSet SetName="InternalIndexSet" IndexPath="~/App_Data/TEMP/ExamineIndexes/Internal/" />
    <!-- The internal index set used by Umbraco back-office for indexing members - DO NOT REMOVE -->
    <IndexSet SetName="InternalMemberIndexSet" IndexPath="~/App_Data/TEMP/ExamineIndexes/InternalMember/">
        <IndexAttributeFields>
            <add Name="id" />
            <add Name="nodeName"/>
            <add Name="updateDate" />
            <add Name="writerName" />
            <add Name="loginName" />
            <add Name="email" />
            <add Name="nodeTypeAlias" />
        </IndexAttributeFields>
    </IndexSet>
    <!-- Default Indexset for external searches, this indexes all fields on all types of nodes-->
    <IndexSet SetName="ExternalIndexSet" IndexPath="~/App_Data/TEMP/ExamineIndexes/External/" />
</ExamineLuceneIndexSets>

Also what version of Examine do you have?

A single instance.

I just noticed that there is no {machinename} in the IndexPath attributes in ExamineIndex.config.

The documentation mentions that for Examine pre-v0.1.80 this needs to be removed, but does that mean for v0.1.80+ it does need to be there? (the site is running Examine v0.1.82)

No, that shouldn't be needed, do you have large indexes?

Nothing in the InternalMemberIndexer.

InternalIndexer: 25062 documents (96 fields)

ExternalIndexer: 24752 documents (96 fields)

In this case your issue is with Examine so changing to TempEnvDirectoryFactory would be my recommendation (you will need to update Examine to 0.1.83+). That said I would recommend using umbracoLocalTempStorage:EnvironmentTemp which will require your updating Umbraco to (7.7.3+) too to avoid other locking issues with auto server migration in Azure Apps.

There is more info on why we added umbracoLocalTempStorage here

Hopefully one day we will be able to store Examine indexes in blob storage and then sync to local temp so we can have the best of all worlds. There has been some work on this but it's not production ready. https://github.com/Shazwazza/Examine/tree/master/src/Examine.AzureDirectory

That’s sad to hear you haven’t had a good experience.

Do you have the above umbracoLocalTempStorage setting in place?

Hi, Jeavon, The setting you asked is set:

  <add key="umbracoLocalTempStorage" value="EnvironmentTemp" />

Should we expect fixes for this in the later Umbraco versions?

That should be set and also do you have the Examine directoryFactory set to use SyncTempEnvDirectoryFactory?

Hi, Jeavon, My directoryFactory is set to TempEnvDirectoryFactory.

directoryFactory="Examine.LuceneEngine.Directories.TempEnvDirectoryFactory,Examine"

Is there a v8 equivalent to this?

Does disabling RebuildOnAppStart setting is really needed? Anyone tested that?

What version of umbraco are you using?

Upgrade examine to 1.0.1 seems to fix it for me on Cloud but not locally, and i was using Umbraco Cloud 8.1.1 and Examine 1.0.0

Be aware that Examine also installs Lucene.Net and SharpZipLib

Where did you put that code?

We are using Umbraco 8.2 on Azure Web App: Web.Config settings are:

<add key="Umbraco.Core.LocalTempStorage" value="EnvironmentTemp" />
<add key="Umbraco.Examine.LuceneDirectoryFactory" value="Examine.LuceneEngine.Directories.SyncTempEnvDirectoryFactory, Examine" />

We don't use any custom indexes.