diff --git a/java-client/build.gradle.kts b/java-client/build.gradle.kts
index 54b114ee0d..ade08b7f0b 100644
--- a/java-client/build.gradle.kts
+++ b/java-client/build.gradle.kts
@@ -177,7 +177,7 @@ signing {
 dependencies {
     // Compile and test with the last 7.x version to make sure transition scenarios where
     // the Java API client coexists with a 7.x HLRC work fine
-    val elasticsearchVersion = "8.19.0"
+    val elasticsearchVersion = "8.19.18"
     val jacksonVersion = "2.17.0"
     val openTelemetryVersion = "1.29.0"
     val jackson3Version = "3.0.0"
diff --git a/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/mapping/TextIndexPrefixes.java b/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/mapping/TextIndexPrefixes.java
index 1802423738..7dc1a8c21b 100644
--- a/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/mapping/TextIndexPrefixes.java
+++ b/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/mapping/TextIndexPrefixes.java
@@ -26,13 +26,13 @@
 import co.elastic.clients.json.JsonpUtils;
 import co.elastic.clients.json.ObjectBuilderDeserializer;
 import co.elastic.clients.json.ObjectDeserializer;
-import co.elastic.clients.util.ApiTypeHelper;
 import co.elastic.clients.util.ObjectBuilder;
 import co.elastic.clients.util.WithJsonObjectBuilderBase;
 import jakarta.json.stream.JsonGenerator;
 import java.lang.Integer;
 import java.util.Objects;
 import java.util.function.Function;
+import javax.annotation.Nullable;
 
 //----------------------------------------------------------------
 //       THIS CODE IS GENERATED. MANUAL EDITS WILL BE LOST.
@@ -59,16 +59,18 @@
  */
 @JsonpDeserializable
 public class TextIndexPrefixes implements JsonpSerializable {
-	private final int maxChars;
+	@Nullable
+	private final Integer maxChars;
 
-	private final int minChars;
+	@Nullable
+	private final Integer minChars;
 
 	// ---------------------------------------------------------------------------------------------
 
 	private TextIndexPrefixes(Builder builder) {
 
-		this.maxChars = ApiTypeHelper.requireNonNull(builder.maxChars, this, "maxChars", 0);
-		this.minChars = ApiTypeHelper.requireNonNull(builder.minChars, this, "minChars", 0);
+		this.maxChars = builder.maxChars;
+		this.minChars = builder.minChars;
 
 	}
 
@@ -77,16 +79,18 @@ public static TextIndexPrefixes of(Function<Builder, ObjectBuilder<TextIndexPref
 	}
 
 	/**
-	 * Required - API name: {@code max_chars}
+	 * API name: {@code max_chars}
 	 */
-	public final int maxChars() {
+	@Nullable
+	public final Integer maxChars() {
 		return this.maxChars;
 	}
 
 	/**
-	 * Required - API name: {@code min_chars}
+	 * API name: {@code min_chars}
 	 */
-	public final int minChars() {
+	@Nullable
+	public final Integer minChars() {
 		return this.minChars;
 	}
 
@@ -101,11 +105,16 @@ public void serialize(JsonGenerator generator, JsonpMapper mapper) {
 
 	protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) {
 
-		generator.writeKey("max_chars");
-		generator.write(this.maxChars);
+		if (this.maxChars != null) {
+			generator.writeKey("max_chars");
+			generator.write(this.maxChars);
 
-		generator.writeKey("min_chars");
-		generator.write(this.minChars);
+		}
+		if (this.minChars != null) {
+			generator.writeKey("min_chars");
+			generator.write(this.minChars);
+
+		}
 
 	}
 
@@ -121,8 +130,10 @@ public String toString() {
 	 */
 
 	public static class Builder extends WithJsonObjectBuilderBase<Builder> implements ObjectBuilder<TextIndexPrefixes> {
+		@Nullable
 		private Integer maxChars;
 
+		@Nullable
 		private Integer minChars;
 
 		public Builder() {
@@ -133,17 +144,17 @@ private Builder(TextIndexPrefixes instance) {
 
 		}
 		/**
-		 * Required - API name: {@code max_chars}
+		 * API name: {@code max_chars}
 		 */
-		public final Builder maxChars(int value) {
+		public final Builder maxChars(@Nullable Integer value) {
 			this.maxChars = value;
 			return this;
 		}
 
 		/**
-		 * Required - API name: {@code min_chars}
+		 * API name: {@code min_chars}
 		 */
-		public final Builder minChars(int value) {
+		public final Builder minChars(@Nullable Integer value) {
 			this.minChars = value;
 			return this;
 		}
diff --git a/java-client/src/main/java/co/elastic/clients/elasticsearch/core/search/SourceConfig.java b/java-client/src/main/java/co/elastic/clients/elasticsearch/core/search/SourceConfig.java
index c4053b4068..bda8571bfc 100644
--- a/java-client/src/main/java/co/elastic/clients/elasticsearch/core/search/SourceConfig.java
+++ b/java-client/src/main/java/co/elastic/clients/elasticsearch/core/search/SourceConfig.java
@@ -186,20 +186,23 @@ public SourceConfig build() {
 	public static final JsonpDeserializer<SourceConfig> _DESERIALIZER = JsonpDeserializer
 			.lazy(() -> JsonpDeserializer.of(EnumSet.of(JsonParser.Event.START_OBJECT, JsonParser.Event.START_ARRAY,
 					JsonParser.Event.VALUE_TRUE, JsonParser.Event.VALUE_FALSE), (parser, mapper, event) -> {
-						return switch (event) {
-							case VALUE_TRUE -> SourceConfig.of(b -> b.fetch(true));
-							case VALUE_FALSE -> SourceConfig.of(b -> b.fetch(false));
-							case START_ARRAY -> {
-								List<String> includes = JsonpDeserializer
-										.arrayDeserializer(JsonpDeserializer.stringDeserializer())
-										.deserialize(parser, mapper, event);
-								yield SourceConfig.of(b -> b.filter(f -> f.includes(includes)));
-							}
-							case START_OBJECT -> {
-								SourceFilter filter = SourceFilter._DESERIALIZER.deserialize(parser, mapper, event);
-								yield SourceConfig.of(b -> b.filter(filter));
-							}
-							default -> null;
-						};
-					}));
+				switch (event) {
+					case VALUE_TRUE :
+						return SourceConfig.of(b -> b.fetch(true));
+					case VALUE_FALSE :
+						return SourceConfig.of(b -> b.fetch(false));
+					case START_ARRAY : {
+						List<String> includes = JsonpDeserializer
+							.arrayDeserializer(JsonpDeserializer.stringDeserializer())
+							.deserialize(parser, mapper, event);
+						return SourceConfig.of(b -> b.filter(f -> f.includes(includes)));
+					}
+					case START_OBJECT : {
+						SourceFilter filter = SourceFilter._DESERIALIZER.deserialize(parser, mapper, event);
+						return SourceConfig.of(b -> b.filter(filter));
+					}
+					default :
+						return null;
+				}
+			}));
 }
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 2e2c94b82b..093456d44e 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
@@ -3381,10 +3381,10 @@
         if (hash.length > 1) {
             hash = hash.substring(1);
         }
-        window.location = "https://github.com/elastic/elasticsearch-specification/tree/7519af4b0af73ca3853a06b148d0951e21e0ca37/specification/" + (paths[hash] || "");
+        window.location = "https://github.com/elastic/elasticsearch-specification/tree/2c64e145d46f8357f9333ce632b7d7a894e05865/specification/" + (paths[hash] || "");
     </script>
 </head>
 <body>
-    Please see the <a href="https://github.com/elastic/elasticsearch-specification/tree/7519af4b0af73ca3853a06b148d0951e21e0ca37/specification/">Elasticsearch API specification</a>.
+    Please see the <a href="https://github.com/elastic/elasticsearch-specification/tree/2c64e145d46f8357f9333ce632b7d7a894e05865/specification/">Elasticsearch API specification</a>.
 </body>
 </html>