Does the eval command overwrite field values in the Splunk index?

The eval command in Splunk is used to create or modify fields during a search process. When this command is executed, it creates temporary fields that exist only in the search results and do not alter the original indexed data or existing field values in the index.

This means that even if a field is modified using the eval command, those changes are not saved or overwritten in the actual data stored in the Splunk index. The original indexed data remains intact and unchanged, preserving its state as it was when ingested.

Therefore, the statement that the eval command overwrites field values in the Splunk index is false, as any modifications made with eval are ephemeral and only affect the results of the current search rather than the index itself.