remove invalid todo in ShardGetService (#85921)

668d557
added some `todo` in `ShardGetService` suggest that source might parsed
and available in the sourceLookup.
https://github.com/elastic/elasticsearch/blob/668d55758b751e848f2b82299e2c5e74af55cd12/src/main/java/org/elasticsearch/index/get/ShardGetService.java#L315
https://github.com/elastic/elasticsearch/blob/668d55758b751e848f2b82299e2c5e74af55cd12/src/main/java/org/elasticsearch/index/get/ShardGetService.java#L431
However ,`SourceLookup` in `ShardGetService` has been remove in #20158
which made these `todo` invalid.  One of them has been removed in #83152
This PR remove the left invalid `todo` in `ShardGetService`

server/src/main/java/org/elasticsearch/index/get/ShardGetService.java

@@ -249,8 +249,6 @@ private GetResult innerGetLoadFromStoredFields(
             if (fetchSourceContext.fetchSource() == false) {
                 source = null;
             } else if (fetchSourceContext.includes().length > 0 || fetchSourceContext.excludes().length > 0) {
-                // TODO: The source might be parsed and available in the sourceLookup but that one uses unordered maps so different.
-                // Do we care?
                 try {
                     source = XContentFieldFilter.newFieldFilter(fetchSourceContext.includes(), fetchSourceContext.excludes())
                         .apply(source, null);