feat(retail): update the api

#### retail:v2

The following keys were deleted:
- resources.projects.resources.locations.resources.catalogs.resources.servingConfigs.methods.predict (Total Keys: 12)
- resources.projects.resources.locations.resources.catalogs.resources.servingConfigs.methods.search (Total Keys: 12)

The following keys were added:
- schemas.GoogleCloudRetailV2SearchRequest.properties.labels (Total Keys: 2)

#### retail:v2alpha

The following keys were deleted:
- resources.projects.resources.locations.resources.catalogs.resources.servingConfigs.methods.predict (Total Keys: 12)
- resources.projects.resources.locations.resources.catalogs.resources.servingConfigs.methods.search (Total Keys: 12)

The following keys were added:
- schemas.GoogleCloudRetailV2alphaImportProductsRequest.properties.skipDefaultBranchProtection.type (Total Keys: 1)
- schemas.GoogleCloudRetailV2alphaSearchRequest.properties.labels (Total Keys: 2)

#### retail:v2beta

The following keys were deleted:
- resources.projects.resources.locations.resources.catalogs.resources.servingConfigs.methods.predict (Total Keys: 12)
- resources.projects.resources.locations.resources.catalogs.resources.servingConfigs.methods.search (Total Keys: 12)

The following keys were added:
- schemas.GoogleCloudRetailV2betaSearchRequest.properties.labels (Total Keys: 2)

Author: yoshi-automation

docs/dyn/retail_v2.projects.locations.catalogs.branches.products.html

@@ -94,11 +94,6 @@ <h2>Instance Methods</h2>
 </p>
 <p class="firstline">Returns the placements Resource.</p>
 
-<p class="toc_element">
-  <code><a href="retail_v2.projects.locations.catalogs.servingConfigs.html">servingConfigs()</a></code>
-</p>
-<p class="firstline">Returns the servingConfigs Resource.</p>
-
 <p class="toc_element">
   <code><a href="retail_v2.projects.locations.catalogs.userEvents.html">userEvents()</a></code>
 </p>
@@ -157,11 +152,11 @@ <h3>Method Details</h3>
     { # Resource that represents completion results.
       &quot;attributes&quot;: { # Custom attributes for the suggestion term. * For &quot;user-data&quot;, the attributes are additional custom attributes ingested through BigQuery. * For &quot;cloud-retail&quot;, the attributes are product attributes generated by Cloud Retail.
         &quot;a_key&quot;: { # A custom attribute that is not explicitly modeled in Product.
-          &quot;indexable&quot;: True or False, # This field will only be used when AttributesConfig.attribute_config_level of the Catalog is &#x27;PRODUCT_LEVEL_ATTRIBUTE_CONFIG&#x27;, if true, custom attribute values are indexed, so that it can be filtered, faceted or boosted in SearchService.Search. This field is ignored in a UserEvent. See SearchRequest.filter, SearchRequest.facet_specs and SearchRequest.boost_spec for more details.
+          &quot;indexable&quot;: True or False, # This field is normally ignored unless AttributesConfig.attribute_config_level of the Catalog is set to the deprecated &#x27;PRODUCT_LEVEL_ATTRIBUTE_CONFIG&#x27; mode. You may learn more on [configuration mode] (https://cloud.google.com/retail/docs/attribute-config#config-modes). if true, custom attribute values are indexed, so that it can be filtered, faceted or boosted in SearchService.Search. This field is ignored in a UserEvent. See SearchRequest.filter, SearchRequest.facet_specs and SearchRequest.boost_spec for more details.
           &quot;numbers&quot;: [ # The numerical values of this custom attribute. For example, `[2.3, 15.4]` when the key is &quot;lengths_cm&quot;. Exactly one of text or numbers should be set. Otherwise, an INVALID_ARGUMENT error is returned.
             3.14,
           ],
-          &quot;searchable&quot;: True or False, # This field will only be used when AttributesConfig.attribute_config_level of the Catalog is &#x27;PRODUCT_LEVEL_ATTRIBUTE_CONFIG&#x27;, if true, custom attribute values are searchable by text queries in SearchService.Search. This field is ignored in a UserEvent. Only set if type text is set. Otherwise, a INVALID_ARGUMENT error is returned.
+          &quot;searchable&quot;: True or False, # This field is normally ignored unless AttributesConfig.attribute_config_level of the Catalog is set to the deprecated &#x27;PRODUCT_LEVEL_ATTRIBUTE_CONFIG&#x27; mode. You may learn more on [configuration mode] (https://cloud.google.com/retail/docs/attribute-config#config-modes). If true, custom attribute values are searchable by text queries in SearchService.Search. This field is ignored in a UserEvent. Only set if type text is set. Otherwise, a INVALID_ARGUMENT error is returned.
           &quot;text&quot;: [ # The textual values of this custom attribute. For example, `[&quot;yellow&quot;, &quot;green&quot;]` when the key is &quot;color&quot;. Empty string is not allowed. Otherwise, an INVALID_ARGUMENT error is returned. Exactly one of text or numbers should be set. Otherwise, an INVALID_ARGUMENT error is returned.
             &quot;A String&quot;,
           ],

docs/dyn/retail_v2.projects.locations.catalogs.html

@@ -179,11 +179,11 @@ <h3>Method Details</h3>
     { # Resource that represents completion results.
       &quot;attributes&quot;: { # Custom attributes for the suggestion term. * For &quot;user-data&quot;, the attributes are additional custom attributes ingested through BigQuery. * For &quot;cloud-retail&quot;, the attributes are product attributes generated by Cloud Retail.
         &quot;a_key&quot;: { # A custom attribute that is not explicitly modeled in Product.
-          &quot;indexable&quot;: True or False, # This field will only be used when AttributesConfig.attribute_config_level of the Catalog is &#x27;PRODUCT_LEVEL_ATTRIBUTE_CONFIG&#x27;, if true, custom attribute values are indexed, so that it can be filtered, faceted or boosted in SearchService.Search. This field is ignored in a UserEvent. See SearchRequest.filter, SearchRequest.facet_specs and SearchRequest.boost_spec for more details.
+          &quot;indexable&quot;: True or False, # This field is normally ignored unless AttributesConfig.attribute_config_level of the Catalog is set to the deprecated &#x27;PRODUCT_LEVEL_ATTRIBUTE_CONFIG&#x27; mode. You may learn more on [configuration mode] (https://cloud.google.com/retail/docs/attribute-config#config-modes). if true, custom attribute values are indexed, so that it can be filtered, faceted or boosted in SearchService.Search. This field is ignored in a UserEvent. See SearchRequest.filter, SearchRequest.facet_specs and SearchRequest.boost_spec for more details.
           &quot;numbers&quot;: [ # The numerical values of this custom attribute. For example, `[2.3, 15.4]` when the key is &quot;lengths_cm&quot;. Exactly one of text or numbers should be set. Otherwise, an INVALID_ARGUMENT error is returned.
             3.14,
           ],
-          &quot;searchable&quot;: True or False, # This field will only be used when AttributesConfig.attribute_config_level of the Catalog is &#x27;PRODUCT_LEVEL_ATTRIBUTE_CONFIG&#x27;, if true, custom attribute values are searchable by text queries in SearchService.Search. This field is ignored in a UserEvent. Only set if type text is set. Otherwise, a INVALID_ARGUMENT error is returned.
+          &quot;searchable&quot;: True or False, # This field is normally ignored unless AttributesConfig.attribute_config_level of the Catalog is set to the deprecated &#x27;PRODUCT_LEVEL_ATTRIBUTE_CONFIG&#x27; mode. You may learn more on [configuration mode] (https://cloud.google.com/retail/docs/attribute-config#config-modes). If true, custom attribute values are searchable by text queries in SearchService.Search. This field is ignored in a UserEvent. Only set if type text is set. Otherwise, a INVALID_ARGUMENT error is returned.
           &quot;text&quot;: [ # The textual values of this custom attribute. For example, `[&quot;yellow&quot;, &quot;green&quot;]` when the key is &quot;color&quot;. Empty string is not allowed. Otherwise, an INVALID_ARGUMENT error is returned. Exactly one of text or numbers should be set. Otherwise, an INVALID_ARGUMENT error is returned.
             &quot;A String&quot;,
           ],