Data migration from solr to elastic?

Elastic Stack Elasticsearch
1

rivers are deprecated.what are other ways to migrate data from solr to elastic?

2

There's recommendations in here on how to replace what rivers used to do:

Question out of curiosity: Why not simply re-index the data into Elasticsearch?

3

because data is stored directly in solr. it is used as nosql DB

4

BTW may be there is a SIMPLE way to ingest csv?

5

Logstash can ingest CSV easily.