How to put user defined dynamic mapping while putting the data in elasticsearch?

Question

I have a document which I want to send in a newly created index (mapping is not yet done). Below is sample document ,

{
   "client" : "",
   "timestamp" : 1587995978942,
   "log_level" : "INFO",
   "log_message" : "Some big message"
}

Now I want to create mapping without calling mapping api. Elasticsearch will add default mapping based on my data like client and log_level will be of type text.But in any possible way am I able to add this mapping by my own without calling mapping api because I want to make client and log_level fields of type keyword. I am using AWS kinesis firehose delivery stream to put data into elasticsearch which dont allow me to create mapping.

Answer 1

One typically uses dynamic_templates but those are also defined within the mappings settings of your index...

An alternative could be utilizing the index template APIs.