{@link State#FINISHED Finalises} the indexing process by calling finaliseon the {@link IndexingDestination}. This method blocks until the whole process is completed. Calls to this method are ignored if the indexer is in a state greater than {@link State#INDEXED}.
This Method is intended to be used by caller that need more control over the indexing process as simple to call {@link #index()}.
@throws IllegalStateException if {@link #getState()} < {@link State#INDEXED}
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