diff --git a/.gitignore b/.gitignore
index 4d8e20aa6..187a76d96 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,4 +20,5 @@ metastore_db
 out/
 localRepo/
 .vscode/
-*.jar
\ No newline at end of file
+*.jar
+.DS_Store
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 89a52ce31..5639991a9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ## [Unreleased]
 ### Added
 - Added basic support for HTTP compression when writing to OpenSearch ([#451](https://github.com/opensearch-project/opensearch-hadoop/pull/451))
+- Added support for k-nn vectors ([#424](https://github.com/opensearch-project/opensearch-hadoop/pull/489))
 
 ### Changed
 
diff --git a/mr/src/main/java/org/opensearch/hadoop/mr/WritableValueReader.java b/mr/src/main/java/org/opensearch/hadoop/mr/WritableValueReader.java
index 77d1ccf64..93933e7ce 100644
--- a/mr/src/main/java/org/opensearch/hadoop/mr/WritableValueReader.java
+++ b/mr/src/main/java/org/opensearch/hadoop/mr/WritableValueReader.java
@@ -72,6 +72,7 @@ public Object createArray(FieldType type) {
         case HALF_FLOAT:
         case SCALED_FLOAT:
         case FLOAT:
+        case KNN_VECTOR:
             arrayType = FloatWritable.class;
             break;
         case DOUBLE:
diff --git a/mr/src/main/java/org/opensearch/hadoop/serialization/FieldType.java b/mr/src/main/java/org/opensearch/hadoop/serialization/FieldType.java
index 10f0e658e..913a99d67 100644
--- a/mr/src/main/java/org/opensearch/hadoop/serialization/FieldType.java
+++ b/mr/src/main/java/org/opensearch/hadoop/serialization/FieldType.java
@@ -54,6 +54,7 @@ public enum FieldType {
     TOKEN_COUNT,
     TEXT, KEYWORD, HALF_FLOAT, SCALED_FLOAT,
     WILDCARD,
+    KNN_VECTOR,
 
     GEO_POINT,
     GEO_SHAPE,
@@ -92,6 +93,7 @@ public enum FieldType {
         CAST_HIERARCHY.put(TEXT,             new LinkedHashSet<FieldType>(Collections.singletonList(KEYWORD)));
         CAST_HIERARCHY.put(KEYWORD,          new LinkedHashSet<FieldType>());
         CAST_HIERARCHY.put(WILDCARD,         new LinkedHashSet<FieldType>(Collections.singletonList(KEYWORD)));
+        CAST_HIERARCHY.put(HALF_FLOAT,       new LinkedHashSet<FieldType>(Arrays.asList(FLOAT)));
         CAST_HIERARCHY.put(HALF_FLOAT,       new LinkedHashSet<FieldType>(Arrays.asList(FLOAT, DOUBLE, KEYWORD)));
         CAST_HIERARCHY.put(SCALED_FLOAT,     new LinkedHashSet<FieldType>(Arrays.asList(DOUBLE, KEYWORD)));
         CAST_HIERARCHY.put(GEO_POINT,        new LinkedHashSet<FieldType>());
@@ -101,6 +103,7 @@ public enum FieldType {
         CAST_HIERARCHY.put(JOIN,             new LinkedHashSet<FieldType>());
         CAST_HIERARCHY.put(IP,               new LinkedHashSet<FieldType>(Collections.singletonList(KEYWORD)));
         CAST_HIERARCHY.put(COMPLETION,       new LinkedHashSet<FieldType>());
+        CAST_HIERARCHY.put(KNN_VECTOR,       new LinkedHashSet<FieldType>(Arrays.asList(FLOAT)));
     }
 
     public static FieldType parse(String name) {
@@ -137,4 +140,4 @@ public LinkedHashSet<FieldType> getCastingTypes() {
         }
         return types;
     }
-}
\ No newline at end of file
+}
diff --git a/mr/src/main/java/org/opensearch/hadoop/serialization/builder/JdkValueReader.java b/mr/src/main/java/org/opensearch/hadoop/serialization/builder/JdkValueReader.java
index ecb3f3008..ea4eeb5c9 100644
--- a/mr/src/main/java/org/opensearch/hadoop/serialization/builder/JdkValueReader.java
+++ b/mr/src/main/java/org/opensearch/hadoop/serialization/builder/JdkValueReader.java
@@ -82,6 +82,7 @@ public Object readValue(Parser parser, String value, FieldType esType) {
             return longValue(value, parser);
         case HALF_FLOAT:
         case FLOAT:
+        case KNN_VECTOR:
             return floatValue(value, parser);
         case SCALED_FLOAT:
         case DOUBLE:
diff --git a/mr/src/test/java/org/opensearch/hadoop/serialization/dto/mapping/MappingTest.java b/mr/src/test/java/org/opensearch/hadoop/serialization/dto/mapping/MappingTest.java
index 58be85449..edada4090 100644
--- a/mr/src/test/java/org/opensearch/hadoop/serialization/dto/mapping/MappingTest.java
+++ b/mr/src/test/java/org/opensearch/hadoop/serialization/dto/mapping/MappingTest.java
@@ -57,6 +57,7 @@
 import static org.opensearch.hadoop.serialization.FieldType.INTEGER;
 import static org.opensearch.hadoop.serialization.FieldType.JOIN;
 import static org.opensearch.hadoop.serialization.FieldType.KEYWORD;
+import static org.opensearch.hadoop.serialization.FieldType.KNN_VECTOR;
 import static org.opensearch.hadoop.serialization.FieldType.LONG;
 import static org.opensearch.hadoop.serialization.FieldType.NESTED;
 import static org.opensearch.hadoop.serialization.FieldType.OBJECT;
@@ -147,7 +148,7 @@ public void testPrimitivesParsing() throws Exception {
         MappingSet mappings = getMappingsForResource("primitives.json");
         Mapping mapping = ensureAndGet("index", "primitives", mappings);
         Field[] props = mapping.getFields();
-        assertEquals(16, props.length);
+        assertEquals(17, props.length);
         assertEquals("field01", props[0].name());
         assertEquals(BOOLEAN, props[0].type());
         assertEquals("field02", props[1].name());
@@ -180,6 +181,8 @@ public void testPrimitivesParsing() throws Exception {
         assertEquals(DATE_NANOS, props[14].type());
         assertEquals("field16", props[15].name());
         assertEquals(WILDCARD, props[15].type());
+        assertEquals("field17", props[16].name());
+        assertEquals(KNN_VECTOR, props[16].type());
     }
 
     @Test
diff --git a/mr/src/test/resources/org/opensearch/hadoop/serialization/dto/mapping/typed/primitives.json b/mr/src/test/resources/org/opensearch/hadoop/serialization/dto/mapping/typed/primitives.json
index 26879c939..1cbc8d0c4 100644
--- a/mr/src/test/resources/org/opensearch/hadoop/serialization/dto/mapping/typed/primitives.json
+++ b/mr/src/test/resources/org/opensearch/hadoop/serialization/dto/mapping/typed/primitives.json
@@ -51,6 +51,9 @@
           },
           "field16" : {
             "type" : "wildcard"
+          },
+          "field17" : {
+            "type" : "knn_vector"
           }
         }
       }
diff --git a/mr/src/test/resources/org/opensearch/hadoop/serialization/dto/mapping/typeless/primitives.json b/mr/src/test/resources/org/opensearch/hadoop/serialization/dto/mapping/typeless/primitives.json
index 1c2f5358c..dbe73dbdf 100644
--- a/mr/src/test/resources/org/opensearch/hadoop/serialization/dto/mapping/typeless/primitives.json
+++ b/mr/src/test/resources/org/opensearch/hadoop/serialization/dto/mapping/typeless/primitives.json
@@ -50,6 +50,9 @@
         },
         "field16" : {
           "type" : "wildcard"
+        },
+        "field17" : {
+          "type" : "knn_vector"
         }
       }
     }
diff --git a/spark/core/src/main/scala/org/opensearch/spark/serialization/ScalaValueReader.scala b/spark/core/src/main/scala/org/opensearch/spark/serialization/ScalaValueReader.scala
index 3ffee8ce3..7d8dad5f7 100644
--- a/spark/core/src/main/scala/org/opensearch/spark/serialization/ScalaValueReader.scala
+++ b/spark/core/src/main/scala/org/opensearch/spark/serialization/ScalaValueReader.scala
@@ -28,12 +28,14 @@
  */
 package org.opensearch.spark.serialization
 
+import java.io.IOException
 import java.util.Collections
 import java.util.Date
 import java.util.{List => JList}
 import scala.collection.JavaConverters.asScalaBufferConverter
 import scala.collection.Seq
 import scala.collection.mutable.LinkedHashMap
+import scala.collection.mutable.ListBuffer
 import scala.collection.mutable.Map
 import org.opensearch.hadoop.serialization.FieldType.BINARY
 import org.opensearch.hadoop.serialization.FieldType.BOOLEAN
@@ -56,6 +58,7 @@ import org.opensearch.hadoop.serialization.FieldType.STRING
 import org.opensearch.hadoop.serialization.FieldType.TEXT
 import org.opensearch.hadoop.serialization.FieldType.TOKEN_COUNT
 import org.opensearch.hadoop.serialization.FieldType.WILDCARD
+import org.opensearch.hadoop.serialization.FieldType.KNN_VECTOR
 import org.opensearch.hadoop.serialization.Parser.Token.VALUE_BOOLEAN
 import org.opensearch.hadoop.serialization.Parser.Token.VALUE_NULL
 import org.opensearch.hadoop.serialization.Parser.Token.VALUE_NUMBER
@@ -103,6 +106,7 @@ class ScalaValueReader extends AbstractValueReader with SettingsAware {
         case BINARY => binaryValue(Option(parser.binaryValue()).getOrElse(value.getBytes()))
         case DATE => date(value, parser)
         case DATE_NANOS => dateNanos(value, parser)
+        case KNN_VECTOR => floatValue(value, parser)
         // GEO is ambiguous so use the JSON type instead to differentiate between doubles (a lot in GEO_SHAPE) and strings
         case GEO_POINT | GEO_SHAPE => {
           if (parser.currentToken() == VALUE_NUMBER) doubleValue(value, parser) else textValue(value, parser)
diff --git a/spark/sql-20/src/itest/scala/org/opensearch/spark/integration/AbstractScalaOpenSearchSparkSQL.scala b/spark/sql-20/src/itest/scala/org/opensearch/spark/integration/AbstractScalaOpenSearchSparkSQL.scala
index 8298acbd1..33eeb7955 100644
--- a/spark/sql-20/src/itest/scala/org/opensearch/spark/integration/AbstractScalaOpenSearchSparkSQL.scala
+++ b/spark/sql-20/src/itest/scala/org/opensearch/spark/integration/AbstractScalaOpenSearchSparkSQL.scala
@@ -52,6 +52,7 @@ import org.apache.spark.sql.types.ArrayType
 import org.apache.spark.sql.types.Decimal
 import org.apache.spark.sql.types.DecimalType
 import org.apache.spark.sql.types.DoubleType
+import org.apache.spark.sql.types.FloatType
 import org.apache.spark.sql.types.IntegerType
 import org.apache.spark.sql.types.MapType
 import org.apache.spark.sql.types.StringType
@@ -2450,6 +2451,50 @@ class AbstractScalaOpenSearchScalaSparkSQL(prefix: String, readMetadata: jl.Bool
     assertEquals("again", samples.get(0).asInstanceOf[Row].get(0))
   }
 
+  /**
+   * Tests the handling of k-nn vector fields.
+   */
+  @Test
+  @Ignore("k-NN plugin is currently missing")
+  def testKnnVectorAsArrayOfFloats(): Unit = {
+    val mapping = wrapMapping("data", s"""{
+      |      "properties": {
+      |        "name": {
+      |          "type": "$keyword"
+      |        },
+      |        "vector": {
+      |          "type": "knn_vector",
+      |          "dimension": 2
+      |        }
+      |      }
+      |  }
+    """.stripMargin)
+
+    val index = wrapIndex("sparksql-test-knnvector-array-knnvector")
+    val typed = "data"
+    val (target, _) = makeTargets(index, typed)
+    RestUtils.touch(index)
+    RestUtils.putMapping(index, typed, mapping.getBytes(StringUtils.UTF_8))
+
+    val arrayOfFloats = """{ "name": "Mini Munchies Pizza", "vector": [ -0.013f, 0.009f ]}""".stripMargin
+    sc.makeRDD(Seq(arrayOfFloats)).saveJsonToOpenSearch(target)
+
+    RestUtils.refresh(index)
+
+    val df = sqc.read.format("opensearch").load(index)
+
+    val dataType = df.schema("vector").dataType
+    assertEquals("array", dataType.typeName)
+    val array = dataType.asInstanceOf[ArrayType]
+    assertEquals(FloatType, array.elementType)
+
+    val head = df.head()
+    val vector = head.getSeq(1)
+    assertEquals(2, vector.length)
+    assertEquals(-0.013f, vector(0))
+    assertEquals(0.009f, vector(1))
+  }
+
   /**
    * Take advantage of the fixed method order and clear out all created indices.
    * The indices will last in OpenSearch for all parameters of this test suite.
diff --git a/spark/sql-20/src/main/scala/org/opensearch/spark/sql/SchemaUtils.scala b/spark/sql-20/src/main/scala/org/opensearch/spark/sql/SchemaUtils.scala
index 232aaf710..62f1b3842 100644
--- a/spark/sql-20/src/main/scala/org/opensearch/spark/sql/SchemaUtils.scala
+++ b/spark/sql-20/src/main/scala/org/opensearch/spark/sql/SchemaUtils.scala
@@ -66,6 +66,7 @@ import org.opensearch.hadoop.serialization.FieldType.GEO_SHAPE
 import org.opensearch.hadoop.serialization.FieldType.INTEGER
 import org.opensearch.hadoop.serialization.FieldType.JOIN
 import org.opensearch.hadoop.serialization.FieldType.KEYWORD
+import org.opensearch.hadoop.serialization.FieldType.KNN_VECTOR
 import org.opensearch.hadoop.serialization.FieldType.LONG
 import org.opensearch.hadoop.serialization.FieldType.NESTED
 import org.opensearch.hadoop.serialization.FieldType.NULL
@@ -169,6 +170,7 @@ private[sql] object SchemaUtils {
       case WILDCARD      => StringType
       case DATE         => if (cfg.getMappingDateRich) TimestampType else StringType
       case DATE_NANOS => if (cfg.getMappingDateRich) TimestampType else StringType
+      case KNN_VECTOR   => DataTypes.createArrayType(FloatType)
       case OBJECT       => convertToStruct(field, geoInfo, absoluteName, arrayIncludes, arrayExcludes, cfg)
       case NESTED       => DataTypes.createArrayType(convertToStruct(field, geoInfo, absoluteName, arrayIncludes, arrayExcludes, cfg))
       case JOIN         => convertToStruct(field, geoInfo, absoluteName, arrayIncludes, arrayExcludes, cfg)
diff --git a/spark/sql-30/src/itest/scala/org/opensearch/spark/integration/AbstractScalaOpenSearchSparkSQL.scala b/spark/sql-30/src/itest/scala/org/opensearch/spark/integration/AbstractScalaOpenSearchSparkSQL.scala
index 3df08754c..47c0090a6 100644
--- a/spark/sql-30/src/itest/scala/org/opensearch/spark/integration/AbstractScalaOpenSearchSparkSQL.scala
+++ b/spark/sql-30/src/itest/scala/org/opensearch/spark/integration/AbstractScalaOpenSearchSparkSQL.scala
@@ -52,6 +52,7 @@ import org.apache.spark.sql.types.ArrayType
 import org.apache.spark.sql.types.Decimal
 import org.apache.spark.sql.types.DecimalType
 import org.apache.spark.sql.types.DoubleType
+import org.apache.spark.sql.types.FloatType
 import org.apache.spark.sql.types.IntegerType
 import org.apache.spark.sql.types.MapType
 import org.apache.spark.sql.types.StringType
@@ -2466,6 +2467,50 @@ class AbstractScalaOpenSearchScalaSparkSQL(prefix: String, readMetadata: jl.Bool
     df.count()
   }
 
+  /**
+   * Tests the handling of k-nn vector fields.
+   */
+  @Test
+  @Ignore("k-NN plugin is currently missing")
+  def testKnnVectorAsArrayOfFloats(): Unit = {
+    val mapping = wrapMapping("data", s"""{
+      |      "properties": {
+      |        "name": {
+      |          "type": "$keyword"
+      |        },
+      |        "vector": {
+      |          "type": "knn_vector",
+      |          "dimension": 2
+      |        }
+      |      }
+      |  }
+    """.stripMargin)
+
+    val index = wrapIndex("sparksql-test-knnvector-array-knnvector")
+    val typed = "data"
+    val (target, _) = makeTargets(index, typed)
+    RestUtils.touch(index)
+    RestUtils.putMapping(index, typed, mapping.getBytes(StringUtils.UTF_8))
+
+    val arrayOfFloats = """{ "name": "Mini Munchies Pizza", "vector": [ -0.013f, 0.009f ]}""".stripMargin
+    sc.makeRDD(Seq(arrayOfFloats)).saveJsonToOpenSearch(target)
+
+    RestUtils.refresh(index)
+
+    val df = sqc.read.format("opensearch").load(index)
+
+    val dataType = df.schema("vector").dataType
+    assertEquals("array", dataType.typeName)
+    val array = dataType.asInstanceOf[ArrayType]
+    assertEquals(FloatType, array.elementType)
+
+    val head = df.head()
+    val vector = head.getSeq(1)
+    assertEquals(2, vector.length)
+    assertEquals(-0.013f, vector(0))
+    assertEquals(0.009f, vector(1))
+  }
+
   /**
    * Take advantage of the fixed method order and clear out all created indices.
    * The indices will last in OpenSearch for all parameters of this test suite.
diff --git a/spark/sql-30/src/main/scala/org/opensearch/spark/sql/SchemaUtils.scala b/spark/sql-30/src/main/scala/org/opensearch/spark/sql/SchemaUtils.scala
index d05b0fef5..e63ca7b43 100644
--- a/spark/sql-30/src/main/scala/org/opensearch/spark/sql/SchemaUtils.scala
+++ b/spark/sql-30/src/main/scala/org/opensearch/spark/sql/SchemaUtils.scala
@@ -67,6 +67,7 @@ import org.opensearch.hadoop.serialization.FieldType.GEO_SHAPE
 import org.opensearch.hadoop.serialization.FieldType.INTEGER
 import org.opensearch.hadoop.serialization.FieldType.JOIN
 import org.opensearch.hadoop.serialization.FieldType.KEYWORD
+import org.opensearch.hadoop.serialization.FieldType.KNN_VECTOR
 import org.opensearch.hadoop.serialization.FieldType.LONG
 import org.opensearch.hadoop.serialization.FieldType.NESTED
 import org.opensearch.hadoop.serialization.FieldType.NULL
@@ -169,6 +170,7 @@ private[sql] object SchemaUtils {
       case WILDCARD     => StringType
       case DATE         => if (cfg.getMappingDateRich) TimestampType else StringType
       case DATE_NANOS   => if (cfg.getMappingDateRich) TimestampType else StringType
+      case KNN_VECTOR   => DataTypes.createArrayType(FloatType)
       case OBJECT       => convertToStruct(field, geoInfo, absoluteName, arrayIncludes, arrayExcludes, cfg)
       case NESTED       => DataTypes.createArrayType(convertToStruct(field, geoInfo, absoluteName, arrayIncludes, arrayExcludes, cfg))
       case JOIN         => convertToStruct(field, geoInfo, absoluteName, arrayIncludes, arrayExcludes, cfg)