Work on this feature has started. Will update here when this becomes generally available.
Thank you for your suggestion and votes.
Thank you for your feedback. This is one of our top voted items, so this is something we would really like to do. We’re considering this for a future release of Azure Search.
Azure Search Product Team
An error occurred while saving the commentVince commented
In addition, we need to be able to change whether an existing property is "Facetable" or "Searchable", and we need to be able to add Suggesters and Custom Analyzers to existing fields in an index.
Without this capability, we can't use any new Azure Search features you release. Requiring us to create a new Search Index every time you release a feature is analogous to requiring users to delete their production database and create a new one every time a database feature is added.
No new Azure Search capabilities can be used by existing production customers until you enable this feature. This is critical!