fix api compat issues

Author: adelinowona

src/MongoDB.Driver/AggregateFluent.cs

@@ -379,15 +379,6 @@ public override IAggregateFluent<TNewResult> Unwind<TNewResult>(FieldDefinition<
             return WithPipeline(_pipeline.Unwind(field, options));
         }
 
-        public override IAggregateFluent<TResult> Rerank(
-            RerankQuery query,
-            FieldDefinition<TResult> path,
-            int numDocsToRerank,
-            string model)
-        {
-            return WithPipeline(_pipeline.Rerank(query, path, numDocsToRerank, model));
-        }
-
         public override IAggregateFluent<TResult> VectorSearch(
             FieldDefinition<TResult> field,
             QueryVector queryVector,

src/MongoDB.Driver/AggregateFluentBase.cs

@@ -331,16 +331,6 @@ public virtual IAggregateFluent<TNewResult> Unwind<TNewResult>(FieldDefinition<T
             throw new NotImplementedException();
         }
 
-        /// <inheritdoc />
-        public virtual IAggregateFluent<TResult> Rerank(
-            RerankQuery query,
-            FieldDefinition<TResult> path,
-            int numDocsToRerank,
-            string model)
-        {
-            throw new NotImplementedException();
-        }
-
         /// <inheritdoc />
         public virtual IAggregateFluent<TResult> VectorSearch(
             FieldDefinition<TResult> field,

src/MongoDB.Driver/IAggregateFluent.cs

@@ -545,20 +545,6 @@ IAggregateFluent<TResult> UnionWith<TWith>(
         /// <returns>The fluent aggregate interface.</returns>
         IAggregateFluent<TNewResult> Unwind<TNewResult>(FieldDefinition<TResult> field, AggregateUnwindOptions<TNewResult> options = null);
 
-        /// <summary>
-        /// Appends a $rerank stage.
-        /// </summary>
-        /// <param name="query">The rerank query.</param>
-        /// <param name="path">The field to send to the reranker.</param>
-        /// <param name="numDocsToRerank">The maximum number of documents to rerank.</param>
-        /// <param name="model">The reranking model name.</param>
-        /// <returns>The fluent aggregate interface.</returns>
-        IAggregateFluent<TResult> Rerank(
-            RerankQuery query,
-            FieldDefinition<TResult> path,
-            int numDocsToRerank,
-            string model);
-
         /// <summary>
         /// Appends a vector search stage.
         /// </summary>

src/MongoDB.Driver/IAggregateFluentExtensions.cs

@@ -1041,6 +1041,27 @@ public static IAggregateFluent<TNewResult> Unwind<TResult, TNewResult>(this IAgg
             return IAsyncCursorSourceExtensions.SingleOrDefaultAsync(aggregate.Limit(2), cancellationToken);
         }
 
+        /// <summary>
+        /// Appends a $rerank stage.
+        /// </summary>
+        /// <typeparam name="TResult">The type of the result.</typeparam>
+        /// <param name="aggregate">The aggregate.</param>
+        /// <param name="query">The rerank query.</param>
+        /// <param name="path">The field to send to the reranker.</param>
+        /// <param name="numDocsToRerank">The maximum number of documents to rerank.</param>
+        /// <param name="model">The reranking model name.</param>
+        /// <returns>The fluent aggregate interface.</returns>
+        public static IAggregateFluent<TResult> Rerank<TResult>(
+            this IAggregateFluent<TResult> aggregate,
+            RerankQuery query,
+            FieldDefinition<TResult> path,
+            int numDocsToRerank,
+            string model)
+        {
+            Ensure.IsNotNull(aggregate, nameof(aggregate));
+            return aggregate.AppendStage(PipelineStageDefinitionBuilder.Rerank(query, path, numDocsToRerank, model));
+        }
+
         /// <summary>
         /// Appends a $rerank stage.
         /// </summary>
@@ -1060,8 +1081,7 @@ public static IAggregateFluent<TResult> Rerank<TResult, TField>(
             string model)
         {
             Ensure.IsNotNull(aggregate, nameof(aggregate));
-
-            return aggregate.Rerank(query, new ExpressionFieldDefinition<TResult>(path), numDocsToRerank, model);
+            return aggregate.AppendStage(PipelineStageDefinitionBuilder.Rerank(query, path, numDocsToRerank, model));
         }
 
         /// <summary>
@@ -1083,7 +1103,6 @@ public static IAggregateFluent<TResult> Rerank<TResult, TField>(
             params Expression<Func<TResult, TField>>[] paths)
         {
             Ensure.IsNotNull(aggregate, nameof(aggregate));
-
             return aggregate.AppendStage(PipelineStageDefinitionBuilder.Rerank(query, numDocsToRerank, model, paths));
         }