This error message indicates a mismatch between the detected type of a value, and the schema type of the value, when the record is being added to a table with a SSTable-Attached Secondary Index defined.
It does allow the database to continue to build the index but will omit the record(s) named in the exception.
This error occurs when an attempt to add the record to a secondary index is made, and the data type of a cell in the row is not valid for the schema of the table. This may be due to a problem with the source data, or, the definition of the table may be incorrect.
First, validate the source data for the updates that caused this error. Additionally, confirm the schema definition for the table matches the expected schema. If needed, users may safely drop and recreate the index without affecting the records in the base table