Best approach to keep DataStore and Index in sync?

You can have a push model or a pull mdoel for updating indexes
incrementally to keep the datastore and the index in sync.
Bypull, using the river, say JDBC if it is a sql DB or writing your own
river.
By push, implenenting an idexer that updates the index using the API calls.

What is the best approach, if you have a complex schema for your index, say
inner object that are complex types themselves.

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