diff --git a/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/analysis/NGramTokenizer.java b/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/analysis/NGramTokenizer.java
index d7b874c81..182048458 100644
--- a/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/analysis/NGramTokenizer.java
+++ b/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/analysis/NGramTokenizer.java
@@ -62,9 +62,11 @@ public class NGramTokenizer extends TokenizerBase implements TokenizerDefinition
 	@Nullable
 	private final String customTokenChars;
 
-	private final int maxGram;
+	@Nullable
+	private final Integer maxGram;
 
-	private final int minGram;
+	@Nullable
+	private final Integer minGram;
 
 	private final List<TokenChar> tokenChars;
 
@@ -74,9 +76,9 @@ private NGramTokenizer(Builder builder) {
 		super(builder);
 
 		this.customTokenChars = builder.customTokenChars;
-		this.maxGram = ApiTypeHelper.requireNonNull(builder.maxGram, this, "maxGram");
-		this.minGram = ApiTypeHelper.requireNonNull(builder.minGram, this, "minGram");
-		this.tokenChars = ApiTypeHelper.unmodifiableRequired(builder.tokenChars, this, "tokenChars");
+		this.maxGram = builder.maxGram;
+		this.minGram = builder.minGram;
+		this.tokenChars = ApiTypeHelper.unmodifiable(builder.tokenChars);
 
 	}
 
@@ -101,21 +103,23 @@ public final String customTokenChars() {
 	}
 
 	/**
-	 * Required - API name: {@code max_gram}
+	 * API name: {@code max_gram}
 	 */
-	public final int maxGram() {
+	@Nullable
+	public final Integer maxGram() {
 		return this.maxGram;
 	}
 
 	/**
-	 * Required - API name: {@code min_gram}
+	 * API name: {@code min_gram}
 	 */
-	public final int minGram() {
+	@Nullable
+	public final Integer minGram() {
 		return this.minGram;
 	}
 
 	/**
-	 * Required - API name: {@code token_chars}
+	 * API name: {@code token_chars}
 	 */
 	public final List<TokenChar> tokenChars() {
 		return this.tokenChars;
@@ -130,12 +134,16 @@ protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) {
 			generator.write(this.customTokenChars);
 
 		}
-		generator.writeKey("max_gram");
-		generator.write(this.maxGram);
+		if (this.maxGram != null) {
+			generator.writeKey("max_gram");
+			generator.write(this.maxGram);
 
-		generator.writeKey("min_gram");
-		generator.write(this.minGram);
+		}
+		if (this.minGram != null) {
+			generator.writeKey("min_gram");
+			generator.write(this.minGram);
 
+		}
 		if (ApiTypeHelper.isDefined(this.tokenChars)) {
 			generator.writeKey("token_chars");
 			generator.writeStartArray();
@@ -160,10 +168,13 @@ public static class Builder extends TokenizerBase.AbstractBuilder<Builder>
 		@Nullable
 		private String customTokenChars;
 
+		@Nullable
 		private Integer maxGram;
 
+		@Nullable
 		private Integer minGram;
 
+		@Nullable
 		private List<TokenChar> tokenChars;
 
 		/**
@@ -175,23 +186,23 @@ public final Builder customTokenChars(@Nullable String value) {
 		}
 
 		/**
-		 * Required - API name: {@code max_gram}
+		 * API name: {@code max_gram}
 		 */
-		public final Builder maxGram(int value) {
+		public final Builder maxGram(@Nullable Integer value) {
 			this.maxGram = value;
 			return this;
 		}
 
 		/**
-		 * Required - API name: {@code min_gram}
+		 * API name: {@code min_gram}
 		 */
-		public final Builder minGram(int value) {
+		public final Builder minGram(@Nullable Integer value) {
 			this.minGram = value;
 			return this;
 		}
 
 		/**
-		 * Required - API name: {@code token_chars}
+		 * API name: {@code token_chars}
 		 * <p>
 		 * Adds all elements of <code>list</code> to <code>tokenChars</code>.
 		 */
@@ -201,7 +212,7 @@ public final Builder tokenChars(List<TokenChar> list) {
 		}
 
 		/**
-		 * Required - API name: {@code token_chars}
+		 * API name: {@code token_chars}
 		 * <p>
 		 * Adds one or more values to <code>tokenChars</code>.
 		 */
diff --git a/java-client/src/main/java/co/elastic/clients/elasticsearch/doc-files/api-spec.html b/java-client/src/main/java/co/elastic/clients/elasticsearch/doc-files/api-spec.html
index 815936f2c..878e21405 100644
--- a/java-client/src/main/java/co/elastic/clients/elasticsearch/doc-files/api-spec.html
+++ b/java-client/src/main/java/co/elastic/clients/elasticsearch/doc-files/api-spec.html
@@ -628,7 +628,7 @@
 '_types.analysis.CharFilter': '_types/analysis/char_filters.ts#L28-L30',
 '_types.analysis.CharFilterBase': '_types/analysis/char_filters.ts#L24-L26',
 '_types.analysis.CharFilterDefinition': '_types/analysis/char_filters.ts#L32-L41',
-'_types.analysis.CharGroupTokenizer': '_types/analysis/tokenizers.ts#L55-L59',
+'_types.analysis.CharGroupTokenizer': '_types/analysis/tokenizers.ts#L58-L62',
 '_types.analysis.CommonGramsTokenFilter': '_types/analysis/token_filters.ts#L174-L180',
 '_types.analysis.CompoundWordTokenFilterBase': '_types/analysis/token_filters.ts#L43-L51',
 '_types.analysis.ConditionTokenFilter': '_types/analysis/token_filters.ts#L182-L186',
@@ -667,7 +667,7 @@
 '_types.analysis.KeepWordsTokenFilter': '_types/analysis/token_filters.ts#L225-L230',
 '_types.analysis.KeywordAnalyzer': '_types/analysis/analyzers.ts#L47-L50',
 '_types.analysis.KeywordMarkerTokenFilter': '_types/analysis/token_filters.ts#L232-L238',
-'_types.analysis.KeywordTokenizer': '_types/analysis/tokenizers.ts#L61-L64',
+'_types.analysis.KeywordTokenizer': '_types/analysis/tokenizers.ts#L64-L67',
 '_types.analysis.KuromojiAnalyzer': '_types/analysis/kuromoji-plugin.ts#L25-L29',
 '_types.analysis.KuromojiIterationMarkCharFilter': '_types/analysis/kuromoji-plugin.ts#L31-L35',
 '_types.analysis.KuromojiPartOfSpeechTokenFilter': '_types/analysis/kuromoji-plugin.ts#L37-L40',
@@ -678,26 +678,26 @@
 '_types.analysis.Language': '_types/analysis/languages.ts#L20-L55',
 '_types.analysis.LanguageAnalyzer': '_types/analysis/analyzers.ts#L52-L59',
 '_types.analysis.LengthTokenFilter': '_types/analysis/token_filters.ts#L244-L248',
-'_types.analysis.LetterTokenizer': '_types/analysis/tokenizers.ts#L66-L68',
+'_types.analysis.LetterTokenizer': '_types/analysis/tokenizers.ts#L69-L71',
 '_types.analysis.LimitTokenCountTokenFilter': '_types/analysis/token_filters.ts#L250-L254',
 '_types.analysis.LowercaseNormalizer': '_types/analysis/normalizers.ts#L26-L28',
 '_types.analysis.LowercaseTokenFilter': '_types/analysis/token_filters.ts#L256-L259',
-'_types.analysis.LowercaseTokenizer': '_types/analysis/tokenizers.ts#L70-L72',
+'_types.analysis.LowercaseTokenizer': '_types/analysis/tokenizers.ts#L73-L75',
 '_types.analysis.MappingCharFilter': '_types/analysis/char_filters.ts#L48-L52',
 '_types.analysis.MultiplexerTokenFilter': '_types/analysis/token_filters.ts#L261-L265',
 '_types.analysis.NGramTokenFilter': '_types/analysis/token_filters.ts#L267-L272',
-'_types.analysis.NGramTokenizer': '_types/analysis/tokenizers.ts#L38-L44',
+'_types.analysis.NGramTokenizer': '_types/analysis/tokenizers.ts#L38-L47',
 '_types.analysis.NoriAnalyzer': '_types/analysis/analyzers.ts#L66-L72',
-'_types.analysis.NoriDecompoundMode': '_types/analysis/tokenizers.ts#L74-L78',
+'_types.analysis.NoriDecompoundMode': '_types/analysis/tokenizers.ts#L77-L81',
 '_types.analysis.NoriPartOfSpeechTokenFilter': '_types/analysis/token_filters.ts#L274-L277',
-'_types.analysis.NoriTokenizer': '_types/analysis/tokenizers.ts#L80-L86',
+'_types.analysis.NoriTokenizer': '_types/analysis/tokenizers.ts#L83-L89',
 '_types.analysis.Normalizer': '_types/analysis/normalizers.ts#L20-L24',
-'_types.analysis.PathHierarchyTokenizer': '_types/analysis/tokenizers.ts#L88-L95',
+'_types.analysis.PathHierarchyTokenizer': '_types/analysis/tokenizers.ts#L91-L98',
 '_types.analysis.PatternAnalyzer': '_types/analysis/analyzers.ts#L74-L81',
 '_types.analysis.PatternCaptureTokenFilter': '_types/analysis/token_filters.ts#L279-L283',
 '_types.analysis.PatternReplaceCharFilter': '_types/analysis/char_filters.ts#L54-L59',
 '_types.analysis.PatternReplaceTokenFilter': '_types/analysis/token_filters.ts#L285-L291',
-'_types.analysis.PatternTokenizer': '_types/analysis/tokenizers.ts#L97-L102',
+'_types.analysis.PatternTokenizer': '_types/analysis/tokenizers.ts#L100-L105',
 '_types.analysis.PhoneticEncoder': '_types/analysis/phonetic-plugin.ts#L23-L36',
 '_types.analysis.PhoneticLanguage': '_types/analysis/phonetic-plugin.ts#L38-L51',
 '_types.analysis.PhoneticNameType': '_types/analysis/phonetic-plugin.ts#L53-L57',
@@ -713,7 +713,7 @@
 '_types.analysis.SnowballLanguage': '_types/analysis/languages.ts#L57-L80',
 '_types.analysis.SnowballTokenFilter': '_types/analysis/token_filters.ts#L310-L313',
 '_types.analysis.StandardAnalyzer': '_types/analysis/analyzers.ts#L95-L99',
-'_types.analysis.StandardTokenizer': '_types/analysis/tokenizers.ts#L104-L107',
+'_types.analysis.StandardTokenizer': '_types/analysis/tokenizers.ts#L107-L110',
 '_types.analysis.StemmerOverrideTokenFilter': '_types/analysis/token_filters.ts#L315-L319',
 '_types.analysis.StemmerTokenFilter': '_types/analysis/token_filters.ts#L321-L325',
 '_types.analysis.StopAnalyzer': '_types/analysis/analyzers.ts#L101-L106',
@@ -721,20 +721,20 @@
 '_types.analysis.SynonymFormat': '_types/analysis/token_filters.ts#L104-L107',
 '_types.analysis.SynonymGraphTokenFilter': '_types/analysis/token_filters.ts#L109-L119',
 '_types.analysis.SynonymTokenFilter': '_types/analysis/token_filters.ts#L121-L131',
-'_types.analysis.TokenChar': '_types/analysis/tokenizers.ts#L46-L53',
+'_types.analysis.TokenChar': '_types/analysis/tokenizers.ts#L49-L56',
 '_types.analysis.TokenFilter': '_types/analysis/token_filters.ts#L345-L347',
 '_types.analysis.TokenFilterBase': '_types/analysis/token_filters.ts#L39-L41',
 '_types.analysis.TokenFilterDefinition': '_types/analysis/token_filters.ts#L349-L401',
-'_types.analysis.Tokenizer': '_types/analysis/tokenizers.ts#L119-L121',
+'_types.analysis.Tokenizer': '_types/analysis/tokenizers.ts#L122-L124',
 '_types.analysis.TokenizerBase': '_types/analysis/tokenizers.ts#L26-L28',
-'_types.analysis.TokenizerDefinition': '_types/analysis/tokenizers.ts#L123-L141',
+'_types.analysis.TokenizerDefinition': '_types/analysis/tokenizers.ts#L126-L144',
 '_types.analysis.TrimTokenFilter': '_types/analysis/token_filters.ts#L327-L329',
 '_types.analysis.TruncateTokenFilter': '_types/analysis/token_filters.ts#L331-L334',
-'_types.analysis.UaxEmailUrlTokenizer': '_types/analysis/tokenizers.ts#L109-L112',
+'_types.analysis.UaxEmailUrlTokenizer': '_types/analysis/tokenizers.ts#L112-L115',
 '_types.analysis.UniqueTokenFilter': '_types/analysis/token_filters.ts#L336-L339',
 '_types.analysis.UppercaseTokenFilter': '_types/analysis/token_filters.ts#L341-L343',
 '_types.analysis.WhitespaceAnalyzer': '_types/analysis/analyzers.ts#L108-L111',
-'_types.analysis.WhitespaceTokenizer': '_types/analysis/tokenizers.ts#L114-L117',
+'_types.analysis.WhitespaceTokenizer': '_types/analysis/tokenizers.ts#L117-L120',
 '_types.analysis.WordDelimiterGraphTokenFilter': '_types/analysis/token_filters.ts#L150-L167',
 '_types.analysis.WordDelimiterTokenFilter': '_types/analysis/token_filters.ts#L133-L148',
 '_types.mapping.AggregateMetricDoubleProperty': '_types/mapping/complex.ts#L61-L66',
@@ -2876,10 +2876,10 @@
         if (hash.length > 1) {
             hash = hash.substring(1);
         }
-        window.location = "https://github.com/elastic/elasticsearch-specification/tree/dd79a332a784748acb9fa3a71b6f8c88295219ac/specification/" + (paths[hash] || "");
+        window.location = "https://github.com/elastic/elasticsearch-specification/tree/1a27080e79e765b656e881871d5d79e939970b95/specification/" + (paths[hash] || "");
     </script>
 </head>
 <body>
-    Please see the <a href="https://github.com/elastic/elasticsearch-specification/tree/dd79a332a784748acb9fa3a71b6f8c88295219ac/specification/">Elasticsearch API specification</a>.
+    Please see the <a href="https://github.com/elastic/elasticsearch-specification/tree/1a27080e79e765b656e881871d5d79e939970b95/specification/">Elasticsearch API specification</a>.
 </body>
 </html>