a04dcfb95b
Introduces `XContentParser#namedObject which works a little like `StreamInput#readNamedWriteable`: on startup components register parsers under names and a superclass. At runtime we look up the parser and call it to parse the object. Right now the parsers take a context object they use to help with the parsing but I hope to be able to eliminate the need for this context as most what it is used for at this point is to move around parser registries which should be replaced by this method eventually. I make no effort to do so in this PR because it is big enough already. This is meant to the a start down a road that allows us to remove classes like `QueryParseContext`, `AggregatorParsers`, `IndicesQueriesRegistry`, and `ParseFieldRegistry`. The goal here is to reduce the amount of plumbing required to allow parsing pluggable things. With this you don't have to pass registries all over the place. Instead you must pass a super registry to fewer places and use it to wrap the reader. This is the same tradeoff that we use for NamedWriteable and it allows much, much simpler binary serialization. We think we want that same thing for xcontent serialization. The only parsing actually converted to this method is parsing `ScoreFunctions` inside of `FunctionScoreQuery`. I chose this because it is relatively self contained. |
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