Update tests to support nested fields

Author: jordan-powers

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/tsdb/20_mapping.yml

@@ -322,7 +322,6 @@ nested dimensions:
       reason: message changed in 8.2.0
 
   - do:
-      catch: /time_series_dimension can't be configured in nested field \[nested.dim\]/
       indices.create:
           index: test
           body:
@@ -351,7 +350,6 @@ nested fields:
       reason: message changed in 8.2.0
 
   - do:
-      catch: /cannot have nested fields when index is in \[index.mode=time_series\]/
       indices.create:
         index: test
         body:

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

@@ -136,11 +136,6 @@ protected void minimalMapping(XContentBuilder b) throws IOException {
         b.field("type", "semantic_text");
     }
 
-    @Override
-    protected String minimalIsInvalidRoutingPathErrorMessage(Mapper mapper) {
-        return "cannot have nested fields when index is in [index.mode=time_series]";
-    }
-
     @Override
     protected void metaMapping(XContentBuilder b) throws IOException {
         super.metaMapping(b);