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diff --git a/src/mongo/db/update/pipeline_executor.h b/src/mongo/db/update/pipeline_executor.h
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+/**
+ *    Copyright (C) 2019-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#pragma once
+
+#include <map>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "mongo/db/pipeline/document_source.h"
+#include "mongo/db/pipeline/pipeline.h"
+#include "mongo/db/update/update_executor.h"
+#include "mongo/stdx/memory.h"
+
+namespace mongo {
+
+/**
+ * An UpdateExecutor representing a pipeline-style update.
+ */
+class PipelineExecutor : public UpdateExecutor {
+
+public:
+    /**
+     * Initializes the node with an aggregation pipeline definition.
+     */
+    explicit PipelineExecutor(const boost::intrusive_ptr<ExpressionContext>& expCtx,
+                              const std::vector<BSONObj>& pipeline);
+
+    /**
+     * Replaces the document that 'applyParams.element' belongs to with 'val'. If 'val' does not
+     * contain an _id, the _id from the original document is preserved. 'applyParams.element' must
+     * be the root of the document. Always returns a result stating that indexes are affected when
+     * the replacement is not a noop.
+     */
+    ApplyResult applyUpdate(ApplyParams applyParams) const final;
+
+    Value serialize() const {
+        std::vector<Value> valueArray;
+        for (const auto& stage : _pipeline->getSources()) {
+            // TODO SERVER-40539: Consider subclassing DocumentSourceQueue with a class that is
+            // explicitly skipped when serializing. With that change call Pipeline::serialize()
+            // directly.
+            if (stage->getSourceName() == "mock"_sd) {
+                continue;
+            }
+
+            stage->serializeToArray(valueArray);
+        }
+
+        return Value(valueArray);
+    }
+
+    void acceptVisitor(UpdateNodeVisitor* visitor) final {
+        visitor->visit(this);
+    }
+
+    void setCollator(const CollatorInterface* collator) final {}
+
+private:
+    boost::intrusive_ptr<ExpressionContext> _expCtx;
+    std::unique_ptr<Pipeline, PipelineDeleter> _pipeline;
+};
+
+}  // namespace mongo