Extension:CirrusSearch/CompletionSuggester

The Completion Suggester is a new experimental algorithm suited for search-as-you-type suggestions. It was initially designed to provide a more fluent user experience.

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Limitations
A small tool to compare the completion suggester and the default suggestion algorithm is available in labs.
 * The completion suggester is enabled only for the main namespace. Searching with a namespace prefix will disable the Completion Suggester and fallback to the default algorithm.
 * The algorithm used to rank suggestions is still under development.