Elastic Analyzers with NGram Tokenizer

ngram-analyzer.cs

private static AnalysisDescriptor Analysis(AnalysisDescriptor analysis) => analysis
	.Tokenizers(t => t.NGram("ngram_tokenizer", p => p.MinGram(2).MaxGram(5)
				 .TokenChars(new List<TokenChar>{Nest.TokenChar.Letter,Nest.TokenChar.Digit}))
			.Standard("standard")
	)
	.TokenFilters(t => t.EdgeNGram("autocomplete_filter", p => p.MinGram(1).MaxGram(40)))
	.CharFilters(c => c.HtmlStrip("html_strip")
		.PatternReplace("pattern_replace", r => r.Pattern(@"([\%\/\\\&\?\,\'\;\:\!\-\_\(\)\.]+)").Replacement(""))
	)
	.Analyzers(
		analyzers => analyzers
			.Custom("autocomplete",
				c => c.Tokenizer("whitespace")
				.Filters("lowercase", "autocomplete_filter")
				.CharFilters("html_strip", "pattern_replace")
		    	)
			.Custom("html_remove", h => h
				.CharFilters("html_strip").Tokenizer("standard")
			)
			.Custom("full_autocomplete", h => h
				.CharFilters("html_strip", "pattern_replace")
				.Filters("lowercase")
				.Tokenizer("standard")
			)
			.Custom("ngram_analyzer", h => h.Tokenizer("ngram_tokenizer").Filters("lowercase"))
);