remove sparse_vector exception change

Author: mromaios

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/mapper/SemanticTextFieldMapper.java

@@ -132,8 +132,6 @@ public class SemanticTextFieldMapper extends FieldMapper implements InferenceFie
     private static final Logger logger = LogManager.getLogger(SemanticTextFieldMapper.class);
     public static final String WARNING_MESSAGE_8X = "Creating a `semantic_text` field on this index version may not include"
         + " optimized default settings. Consider creating a new index for better performance.";
-    public static final String ERROR_MESSAGE_UNSUPPORTED_SPARSE_VECTOR = "Creating a `semantic_text` field with `sparse_vector` models"
-        + " is not supported on this index. Try using a `dense_vector` model or create a new index with version 8.11+.";
     public static final NodeFeature SEMANTIC_TEXT_IN_OBJECT_FIELD_FIX = new NodeFeature("semantic_text.in_object_field_fix");
     public static final NodeFeature SEMANTIC_TEXT_SINGLE_FIELD_UPDATE_FIX = new NodeFeature("semantic_text.single_field_update_fix");
     public static final NodeFeature SEMANTIC_TEXT_DELETE_FIX = new NodeFeature("semantic_text.delete_fix");
@@ -1283,10 +1281,6 @@ private static void configureSparseVectorMapperBuilder(
         SparseVectorFieldMapper.Builder sparseVectorMapperBuilder,
         SemanticTextIndexOptions indexOptions
     ) {
-        if (indexVersionCreated.before(NEW_SPARSE_VECTOR)) {
-            throw new IllegalArgumentException(ERROR_MESSAGE_UNSUPPORTED_SPARSE_VECTOR);
-        }
-
         if (indexOptions != null) {
             SparseVectorFieldMapper.SparseVectorIndexOptions sparseVectorIndexOptions =
                 (SparseVectorFieldMapper.SparseVectorIndexOptions) indexOptions.indexOptions();

x-pack/plugin/inference/src/test/java/org/elasticsearch/xpack/inference/mapper/SemanticTextFieldMapperTests.java

@@ -440,28 +440,6 @@ public void testOldIndexSemanticTextDenseVectorCreation() throws IOException {
         assertSemanticTextField(mapperService, fieldName, true, null, null);
     }
 
-    public void testOldIndexSemanticTextSparseVersionRaisesError() throws IOException {
-        final XContentBuilder fieldMapping = fieldMapping(b -> {
-            b.field("type", "semantic_text");
-            b.field("inference_id", "another_inference_id");
-            b.startObject("model_settings");
-            b.field("task_type", "sparse_embedding");
-            b.endObject();
-        });
-
-        MapperParsingException exception = assertThrows(
-            MapperParsingException.class,
-            () -> createMapperService(
-                fieldMapping,
-                true,
-                IndexVersions.V_8_0_0,
-                IndexVersionUtils.getPreviousVersion(IndexVersions.NEW_SPARSE_VECTOR)
-            )
-        );
-        assertTrue(exception.getMessage().contains(ERROR_MESSAGE_UNSUPPORTED_SPARSE_VECTOR));
-        assertTrue(exception.getRootCause() instanceof IllegalArgumentException);
-    }
-
     public void testMultiFieldsSupport() throws IOException {
         if (useLegacyFormat) {
             Exception e = expectThrows(MapperParsingException.class, () -> createMapperService(fieldMapping(b -> {