Allow analysis components to be specified in Analyze API requests

[russcam]

The Analyze API supports composing transient analyzers from built-in components, allowing configuration for components that have options, to be specified using object notation:

GET _analyze
{
    "tokenizer" : "standard",
    "char_filter": [{ "type": "mapping", "mappings": ["F# => FSharp"] }],
    "filter": ["lowercase", { "type": "stop", "stopwords": ["_english_", "the"] }],
    "text" : ["F# is THE SUPERIOR language :)"]
}

NEST currently supports only sending string arrays for char_filter, filter, analyzer and tokenizer. This should be changed to also support analysis components with options.