diff --git a/lib/helpers/query/castUpdate.js b/lib/helpers/query/castUpdate.js
index 1ee20fb41f2..29b16c9824d 100644
--- a/lib/helpers/query/castUpdate.js
+++ b/lib/helpers/query/castUpdate.js
@@ -204,7 +204,7 @@ function walkUpdatePath(schema, obj, op, options, context, filter, pref) {
       schematype = schema._getSchema(prefix + key);
 
       if (schematype == null) {
-        const _res = getEmbeddedDiscriminatorPath(schema, obj, filter, prefix + key);
+        const _res = getEmbeddedDiscriminatorPath(schema, obj, filter, prefix + key, options);
         if (_res.schematype != null) {
           schematype = _res.schematype;
         }
@@ -324,7 +324,7 @@ function walkUpdatePath(schema, obj, op, options, context, filter, pref) {
       // If no schema type, check for embedded discriminators because the
       // filter or update may imply an embedded discriminator type. See #8378
       if (schematype == null) {
-        const _res = getEmbeddedDiscriminatorPath(schema, obj, filter, checkPath);
+        const _res = getEmbeddedDiscriminatorPath(schema, obj, filter, checkPath, options);
         if (_res.schematype != null) {
           schematype = _res.schematype;
           pathDetails = _res.type;
diff --git a/lib/helpers/query/getEmbeddedDiscriminatorPath.js b/lib/helpers/query/getEmbeddedDiscriminatorPath.js
index 395ea75c4bf..f4dc839b9c7 100644
--- a/lib/helpers/query/getEmbeddedDiscriminatorPath.js
+++ b/lib/helpers/query/getEmbeddedDiscriminatorPath.js
@@ -3,19 +3,23 @@
 const cleanPositionalOperators = require('../schema/cleanPositionalOperators');
 const get = require('../get');
 const getDiscriminatorByValue = require('../discriminator/getDiscriminatorByValue');
+const updatedPathsByArrayFilter = require('../update/updatedPathsByArrayFilter');
 
 /*!
  * Like `schema.path()`, except with a document, because impossible to
  * determine path type without knowing the embedded discriminator key.
  */
 
-module.exports = function getEmbeddedDiscriminatorPath(schema, update, filter, path) {
+module.exports = function getEmbeddedDiscriminatorPath(schema, update, filter, path, options) {
   const parts = path.split('.');
   let schematype = null;
   let type = 'adhocOrUndefined';
 
   filter = filter || {};
   update = update || {};
+  const arrayFilters = options != null && Array.isArray(options.arrayFilters) ?
+    options.arrayFilters : [];
+  const updatedPathsByFilter = updatedPathsByArrayFilter(update);
 
   for (let i = 0; i < parts.length; ++i) {
     const subpath = cleanPositionalOperators(parts.slice(0, i + 1).join('.'));
@@ -39,6 +43,7 @@ module.exports = function getEmbeddedDiscriminatorPath(schema, update, filter, p
       if (discriminatorFilterPath in filter) {
         discriminatorKey = filter[discriminatorFilterPath];
       }
+
       const wrapperPath = subpath.replace(/\.\d+$/, '');
       if (schematype.$isMongooseDocumentArrayElement &&
           get(filter[wrapperPath], '$elemMatch.' + key) != null) {
@@ -49,6 +54,17 @@ module.exports = function getEmbeddedDiscriminatorPath(schema, update, filter, p
         discriminatorKey = update[discriminatorValuePath];
       }
 
+      for (const filterKey of Object.keys(updatedPathsByFilter)) {
+        const schemaKey = updatedPathsByFilter[filterKey] + '.' + key;
+        const arrayFilterKey = filterKey + '.' + key;
+        if (schemaKey === discriminatorFilterPath) {
+          const filter = arrayFilters.find(filter => filter.hasOwnProperty(arrayFilterKey));
+          if (filter != null) {
+            discriminatorKey = filter[arrayFilterKey];
+          }
+        }
+      }
+
       if (discriminatorKey == null) {
         continue;
       }
diff --git a/lib/helpers/update/castArrayFilters.js b/lib/helpers/update/castArrayFilters.js
index fef89346393..a9992f2a507 100644
--- a/lib/helpers/update/castArrayFilters.js
+++ b/lib/helpers/update/castArrayFilters.js
@@ -3,7 +3,7 @@
 const castFilterPath = require('../query/castFilterPath');
 const cleanPositionalOperators = require('../schema/cleanPositionalOperators');
 const getPath = require('../schema/getPath');
-const modifiedPaths = require('./modifiedPaths');
+const updatedPathsByArrayFilter = require('./updatedPathsByArrayFilter');
 
 module.exports = function castArrayFilters(query) {
   const arrayFilters = query.options.arrayFilters;
@@ -15,24 +15,7 @@ module.exports = function castArrayFilters(query) {
   const schema = query.schema;
   const strictQuery = schema.options.strictQuery;
 
-  const updatedPaths = modifiedPaths(update);
-
-  const updatedPathsByFilter = Object.keys(updatedPaths).reduce((cur, path) => {
-    const matches = path.match(/\$\[[^\]]+\]/g);
-    if (matches == null) {
-      return cur;
-    }
-    for (const match of matches) {
-      const firstMatch = path.indexOf(match);
-      if (firstMatch !== path.lastIndexOf(match)) {
-        throw new Error(`Path '${path}' contains the same array filter multiple times`);
-      }
-      cur[match.substring(2, match.length - 1)] = path.
-        substr(0, firstMatch - 1).
-        replace(/\$\[[^\]]+\]/g, '0');
-    }
-    return cur;
-  }, {});
+  const updatedPathsByFilter = updatedPathsByArrayFilter(update);
 
   for (const filter of arrayFilters) {
     if (filter == null) {
diff --git a/lib/helpers/update/updatedPathsByArrayFilter.js b/lib/helpers/update/updatedPathsByArrayFilter.js
new file mode 100644
index 00000000000..7cbae298402
--- /dev/null
+++ b/lib/helpers/update/updatedPathsByArrayFilter.js
@@ -0,0 +1,24 @@
+'use strict';
+
+const modifiedPaths = require('./modifiedPaths');
+
+module.exports = function updatedPathsByArrayFilter(update) {
+  const updatedPaths = modifiedPaths(update);
+
+  return Object.keys(updatedPaths).reduce((cur, path) => {
+    const matches = path.match(/\$\[[^\]]+\]/g);
+    if (matches == null) {
+      return cur;
+    }
+    for (const match of matches) {
+      const firstMatch = path.indexOf(match);
+      if (firstMatch !== path.lastIndexOf(match)) {
+        throw new Error(`Path '${path}' contains the same array filter multiple times`);
+      }
+      cur[match.substring(2, match.length - 1)] = path.
+        substr(0, firstMatch - 1).
+        replace(/\$\[[^\]]+\]/g, '0');
+    }
+    return cur;
+  }, {});
+};
\ No newline at end of file
diff --git a/lib/query.js b/lib/query.js
index ba43a98c912..86e2e627a22 100644
--- a/lib/query.js
+++ b/lib/query.js
@@ -4586,7 +4586,8 @@ Query.prototype._castUpdate = function _castUpdate(obj, overwrite) {
     strict: strict,
     omitUndefined,
     useNestedStrict: useNestedStrict,
-    upsert: upsert
+    upsert: upsert,
+    arrayFilters: this.options.arrayFilters
   }, this, this._conditions);
 };