There are no Dgraph process flags necessary to enable the search characters feature. The Oracle Endeca Server automatically detects the additional search characters.
The Oracle Endeca Server supports an important closely related feature: automatic mapping of ISO-Latin1 international characters to ASCII equivalents in text search queries. You can specify this mapping with the --latin1 flag for the Dgraph. This option allows search queries containing international characters such as Spätlese to match against Anglicized result text such as Spatlese. Using the --latin1 flag causes the Latin1 mappings to be applied to search queries.