I helped a user move data from CouchDB to Couchbase by using the REST API to retrieve documents and then parsing each line of the response. I used Java 8's stream API and RxJava to create an observable that emits CouchDB documents, which I then sent to Couchbase using a flatMap operator to parse each document into a RawJsonDocument. The import process involved handling special cases for the first and last lines of the response, as well as logging errors and counting successful imports. The code used retries with exponential backoff and logging mechanisms to handle potential failures during the import process.