So, i have an application deployed in production that uses a non-standard document type name (logEvent).
Can I upgrade to 7.0, or am I stuck to 6.x forever? Basically, I have this problem:
- if I ask the clients to upgrade the ElasticSearch servers first, the application will no longer work - NEST 6.x is not compatible with Elasticsearch7, and will issue REST API requests that do not work.
- if I ask the clients to upgrade my application first, then it will no longer work with their Elasticsearch deployment - since the NEST client no longer supports specifying a document type, and I presume it will always hit the "_doc" endpoints, thus likely failing.
I'd like to perform the upgrade without downtime on the client side. Is that even possible? I could tell them to reindex into a new index where the document type is _doc .... but then data is continuously flowing in, I don't see how I can do the switch without losing data (at least temporarily; and the procedure for getting all data reindexed would be fairly convoluted and would require 2 successive reindexes).
It just seems I'm missing something. Isn't there a simpler way? Has nobody had this problem before? How does one upgrade a production system to 7.x ?