Bug Search sends a prefix-list as a hash and not an array to search subsystem

[Xon]

If the c.prefixes query parameter has the value c[prefixes][10]=1&c[prefixes][11]=2, and XFES is installed, elasticsearch can throw something like "Elasticsearch error: [terms] query does not support [0] within lookup element".

This happens because of this code;
PHP:

		$prefixes = $request->filter('c.prefixes', 'array-uint');
		$prefixes = array_unique($prefixes);
		if ($prefixes && reset($prefixes))
		{
			$query->withMetadata('prefix', $prefixes);
		}

The line $prefixes =...

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