Increase the number of vector dims to 2048 (#46895)

Author: mayya-sharipova

docs/reference/mapping/types/dense-vector.asciidoc

@@ -8,7 +8,7 @@
 
 A `dense_vector` field stores dense vectors of float values.
 The maximum number of dimensions that can be in a vector should
-not exceed 1024. A `dense_vector` field is a single-valued field.
+not exceed 2048. A `dense_vector` field is a single-valued field.
 
 These vectors can be used for <<vector-functions,document scoring>>.
 For example, a document score can represent a distance between

x-pack/plugin/vectors/src/main/java/org/elasticsearch/xpack/vectors/mapper/DenseVectorFieldMapper.java

@@ -43,7 +43,7 @@
 public class DenseVectorFieldMapper extends FieldMapper implements ArrayValueMapperParser {
 
     public static final String CONTENT_TYPE = "dense_vector";
-    public static short MAX_DIMS_COUNT = 1024; //maximum allowed number of dimensions
+    public static short MAX_DIMS_COUNT = 2048; //maximum allowed number of dimensions
     private static final byte INT_BYTES = 4;
 
     public static class Defaults {

x-pack/plugin/vectors/src/test/java/org/elasticsearch/xpack/vectors/mapper/DenseVectorFieldMapperTests.java

@@ -61,7 +61,7 @@ public void testMappingExceedDimsLimit() throws IOException {
             .endObject()
             .endObject());
         MapperParsingException e = expectThrows(MapperParsingException.class, () -> parser.parse("_doc", new CompressedXContent(mapping)));
-        assertEquals(e.getMessage(), "The number of dimensions for field [my-dense-vector] should be in the range [1, 1024]");
+        assertEquals(e.getMessage(), "The number of dimensions for field [my-dense-vector] should be in the range [1, 2048]");
     }
 
     public void testDefaults() throws Exception {