chore: remove nullable

Author: shanewxy

schema.yaml

@@ -19,15 +19,13 @@ components:
             domain_suffix:
               description: |
                 Specify the domain suffix of the CloudMap. The domain suffix must be a valid DNS name.
-              nullable: true
               title: Domain Suffix
               type: string
               x-walrus-ui:
                 order: 3
             kms_key_id:
               description: |
                 Specify the KMS key ID which to encrypt the Redis data. If not specified, the Redis data will not be encrypted.
-              nullable: true
               title: Kms Key Id
               type: string
               x-walrus-ui:
@@ -51,7 +49,6 @@ components:
           enum:
           - standalone
           - replication
-          nullable: true
           x-walrus-ui:
             group: Basic
             order: 3
@@ -65,7 +62,6 @@ components:
           - 1
           - 3
           - 5
-          nullable: true
           x-walrus-ui:
             group: Basic
             order: 4
@@ -79,7 +75,6 @@ components:
           enum:
           - "7.0"
           - "6.0"
-          nullable: true
           x-walrus-ui:
             group: Basic
             order: 5
@@ -107,7 +102,6 @@ components:
             type: object
             x-walrus-ui:
               colSpan: 12
-          nullable: true
           x-walrus-ui:
             colSpan: 12
             group: Basic
@@ -120,7 +114,6 @@ components:
             Specify the account password. If not specified, it will generate a random password. The password must be 16-32 characters long and start with any letter, number, or the following symbols: ! # $ % ^ & * ( ) _ + - =.
             If not specified, it will generate a random password.
           format: password
-          nullable: true
           writeOnly: true
           minLength: 16
           maxLength: 32
@@ -134,13 +127,11 @@ components:
             Specify the computing resources.
           default:
             class: cache.t3.micro
-          nullable: true
           properties:
             class:
               default: cache.t3.micro
               description: |
                 Specify the computing resources. See https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/CacheNodes.SupportedTypes.html.
-              nullable: true
               title: Class
               type: string
               x-walrus-ui: