revert firestore due to failing system tests

Author: parthea

.librarian/state.yaml

@@ -1884,7 +1884,7 @@ libraries:
       - packages/google-cloud-financialservices/
     tag_format: '{id}-v{version}'
   - id: google-cloud-firestore
-    version: 2.27.0
+    version: 2.26.0
     last_generated_commit: 59d5f2b46924714af627ac29ea6de78641a00835
     apis:
       - path: google/firestore/admin/v1

packages/google-cloud-firestore/CHANGELOG.md

@@ -4,25 +4,6 @@
 
 [1]: https://pypi.org/project/google-cloud-firestore/#history
 
-## [2.27.0](https://github.com/googleapis/google-cloud-python/compare/google-cloud-firestore-v2.26.0...google-cloud-firestore-v2.27.0) (2026-04-02)
-
-
-### Features
-
-* add new pipeline expressions (#16151) ([4615c413c86f3f611e801fc9155fe54bb8dcf386](https://github.com/googleapis/google-cloud-python/commit/4615c413c86f3f611e801fc9155fe54bb8dcf386))
-* literals pipeline stage (#16028) ([cf50cea185f2ad4763a14f1f0c14ca50fc2fe418](https://github.com/googleapis/google-cloud-python/commit/cf50cea185f2ad4763a14f1f0c14ca50fc2fe418))
-* support object functions (#16132) ([e649a9024219d281050d159903b87e20a3665d86](https://github.com/googleapis/google-cloud-python/commit/e649a9024219d281050d159903b87e20a3665d86))
-* support array functions (#16128) ([c95e03831290765b6f950055f5f3749132c37426](https://github.com/googleapis/google-cloud-python/commit/c95e03831290765b6f950055f5f3749132c37426))
-* support string expressions (#16152) ([8aa697acc7d86daf228dd52fabb7d1f14bd05c84](https://github.com/googleapis/google-cloud-python/commit/8aa697acc7d86daf228dd52fabb7d1f14bd05c84))
-* Allow Protobuf 7.x ([1eb7c268482e55971966e284dac2cbeb903adcbb](https://github.com/googleapis/google-cloud-python/commit/1eb7c268482e55971966e284dac2cbeb903adcbb))
-
-
-### Bug Fixes
-
-* Require Python 3.9 ([1eb7c268482e55971966e284dac2cbeb903adcbb](https://github.com/googleapis/google-cloud-python/commit/1eb7c268482e55971966e284dac2cbeb903adcbb))
-* Require google-api-core >= 2.11.0 ([1eb7c268482e55971966e284dac2cbeb903adcbb](https://github.com/googleapis/google-cloud-python/commit/1eb7c268482e55971966e284dac2cbeb903adcbb))
-* Improve type checking ([1eb7c268482e55971966e284dac2cbeb903adcbb](https://github.com/googleapis/google-cloud-python/commit/1eb7c268482e55971966e284dac2cbeb903adcbb))
-
 ## [2.26.0](https://github.com/googleapis/google-cloud-python/compare/google-cloud-firestore-v2.25.0...google-cloud-firestore-v2.26.0) (2026-03-23)
 
 

packages/google-cloud-firestore/google/cloud/firestore/gapic_version.py

@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "2.27.0"  # {x-release-please-version}
+__version__ = "2.26.0"  # {x-release-please-version}

packages/google-cloud-firestore/google/cloud/firestore_admin/gapic_version.py

@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "2.27.0"  # {x-release-please-version}
+__version__ = "2.26.0"  # {x-release-please-version}

packages/google-cloud-firestore/google/cloud/firestore_admin_v1/gapic_version.py

@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "2.27.0"  # {x-release-please-version}
+__version__ = "2.26.0"  # {x-release-please-version}

packages/google-cloud-firestore/google/cloud/firestore_bundle/gapic_version.py

@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "2.27.0"  # {x-release-please-version}
+__version__ = "2.26.0"  # {x-release-please-version}

packages/google-cloud-firestore/google/cloud/firestore_v1/gapic_version.py

@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "2.27.0"  # {x-release-please-version}
+__version__ = "2.26.0"  # {x-release-please-version}

packages/google-cloud-firestore/samples/generated_samples/snippet_metadata_google.firestore.admin.v1.json

@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-cloud-firestore-admin",
-    "version": "2.27.0"
+    "version": "2.26.0"
   },
   "snippets": [
     {

packages/google-cloud-firestore/samples/generated_samples/snippet_metadata_google.firestore.v1.json

@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-cloud-firestore",
-    "version": "2.27.0"
+    "version": "2.26.0"
   },
   "snippets": [
     {