void removeIndex(int columnIndex) throws IOException {
		IndexTable indexTable = secondaryIndexes.get(columnIndex);
		if (indexTable != null) {
			indexTable.deleteAll();
			db.getMasterTable().deleteTableRecord(indexTable.getTableNum());
			secondaryIndexes.remove(columnIndex);
			indexedColumns = secondaryIndexes.getKeys();
		}
	}
Remove the index associated with the specified column.
@param columnIndex column corresponding to the column index which 
should be deleted.
@throws IOException thrown if IO error occurs
Ghidra/Framework/DB/src/main/java/db/Table.java