Lucene.Net.Store.Azure.AzureDirectory: Enable usage with a sasuri and existing containers about lucenenet

[Shazwazza]

Hi, Lucene.Net.Store.Azure.AzureDirectory is a 'dead' library and isn't maintained. Much of it has been forked in various repos and attempted to be updated to work. Most people don't fully understand what is actually does though:

What is doesn't do:

• It does not allow you to share indexes between processes

What it does do:

• It 'syncs' the lucene files from a central storage (i.e. Blob Storage) to local storage of the current process (i.e. %temp%) folder
• It attempts to keep both the local storage and central storage in sync
• When an Azure App Service using this library is moved to another worker, it will re-sync the main storage to local storage in an attempt to keep working as it was on the previous worker

The lib isn't maintained because this underlying process has several issues because depending on the index activity, writing this much to blob storage and local storage and keeping it in sync is difficult and can easily cause index corruption issues.

I have a similar implementation in the Examine library that is actively used by tons of Umbraco websites which is stable: https://github.com/Shazwazza/Examine/blob/release/3.0/src/Examine.Lucene/Directories/SyncedFileSystemDirectoryFactory.cs

This doesn't use Blob storage, but just the main file system in Azure App Service (which is a network drive) and syncs to the local %temp% file system.