We have approximately a year's worth of data in our Splunk Cloud instance. Due to certain reasons, we need to export all the indexed data from Splunk Cloud into readable files. What are the possible ways to achieve this?
You could try opening a support case to see if they will export your data.
Consider using the REST API to run queries (index=foo earliest=0 latest=now | table *) that return all the data from an index and then save that data in the desired format.