Merge pull request #39 from afoucret/beta-notice

Update readme with beta notices.

Author: afoucret

README.md

@@ -4,6 +4,9 @@
 
 > A first-party Magento integration for building excellent, relevant search experiences with [Elastic App Search](https://www.elastic.co/cloud/app-search-service).
 
+> **:warning: This is a beta version of the client. [View known issues](#known-issues).**
+
+
 ## Contents
 
 - [Getting started](#getting-started-)
@@ -94,6 +97,19 @@ bin/magento cache:clean
 bin/magento indexer:reindex catalogsearch_fulltext
 ```
 
+### Known issues
+
+The module is in its first round of beta. This first round is intended to act as a technical preview, which aims to integrate App Search as a Magento search adapter interface.
+
+There are a few caveats with the current implementation:
+
+- The maximum number of fields allowed by App Search (currently 64) does not allow you to index catalogs with too many products attributes (#37)
+
+- We will need to rework how product prices are stored into App Search to allow sites with a large number of customer groups to be indexed (#38)
+
+- Search relevance is still being tuned.
+
+
 ## Development
 
 We ❤️ developers and want everyone to be able to contribute to the module.