Removes the now obsolete SearchParseElement implementations #18233
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All implementations of SearchParseElement have been removed since they are no longer used now that parsing is done on the coordinating node. The SearchParseElement and FetchSubPhaseParseElement classes are not removed as currently they are needed for plugins that add a custom fetch sub phase. These will be removed in a follow up PR that will allow fetch sub phase plugins to register a parser in a different way.