De/serialize pipe-delimited array of RegexFlags (#11461)

* De/serialize |-delimited array of RegexFlags

Fixes #10748

* Declare related read-only collection properties

* Update public APIs

* Resolve PR feedback

Author: heaths

sdk/search/Azure.Search.Documents/api/Azure.Search.Documents.netstandard2.0.cs

@@ -1109,10 +1109,10 @@ public PathHierarchyTokenizerV2(string name) : base (default(string)) { }
     public partial class PatternAnalyzer : Azure.Search.Documents.Models.Analyzer
     {
         public PatternAnalyzer(string name) : base (default(string)) { }
-        public Azure.Search.Documents.Models.RegexFlags? Flags { get { throw null; } set { } }
+        public System.Collections.Generic.IList<Azure.Search.Documents.Models.RegexFlags> Flags { get { throw null; } }
         public bool? LowerCaseTerms { get { throw null; } set { } }
         public string Pattern { get { throw null; } set { } }
-        public System.Collections.Generic.IList<string> Stopwords { get { throw null; } set { } }
+        public System.Collections.Generic.IList<string> Stopwords { get { throw null; } }
     }
     public partial class PatternCaptureTokenFilter : Azure.Search.Documents.Models.TokenFilter
     {
@@ -1135,7 +1135,7 @@ public PatternReplaceTokenFilter(string name, string pattern, string replacement
     public partial class PatternTokenizer : Azure.Search.Documents.Models.Tokenizer
     {
         public PatternTokenizer(string name) : base (default(string)) { }
-        public Azure.Search.Documents.Models.RegexFlags? Flags { get { throw null; } set { } }
+        public System.Collections.Generic.IList<Azure.Search.Documents.Models.RegexFlags> Flags { get { throw null; } }
         public int? Group { get { throw null; } set { } }
         public string Pattern { get { throw null; } set { } }
     }
@@ -1268,18 +1268,18 @@ public partial class SearchIndex
     {
         public SearchIndex(string name) { }
         public SearchIndex(string name, System.Collections.Generic.IEnumerable<Azure.Search.Documents.Models.SearchField> fields) { }
-        public System.Collections.Generic.IList<Azure.Search.Documents.Models.Analyzer> Analyzers { get { throw null; } set { } }
-        public System.Collections.Generic.IList<Azure.Search.Documents.Models.CharFilter> CharFilters { get { throw null; } set { } }
+        public System.Collections.Generic.IList<Azure.Search.Documents.Models.Analyzer> Analyzers { get { throw null; } }
+        public System.Collections.Generic.IList<Azure.Search.Documents.Models.CharFilter> CharFilters { get { throw null; } }
         public Azure.Search.Documents.Models.CorsOptions CorsOptions { get { throw null; } set { } }
         public string DefaultScoringProfile { get { throw null; } set { } }
         public Azure.Search.Documents.Models.EncryptionKey EncryptionKey { get { throw null; } set { } }
         public string ETag { get { throw null; } set { } }
         public System.Collections.Generic.IList<Azure.Search.Documents.Models.SearchField> Fields { get { throw null; } }
         public string Name { get { throw null; } }
-        public System.Collections.Generic.IList<Azure.Search.Documents.Models.ScoringProfile> ScoringProfiles { get { throw null; } set { } }
-        public System.Collections.Generic.IList<Azure.Search.Documents.Models.Suggester> Suggesters { get { throw null; } set { } }
-        public System.Collections.Generic.IList<Azure.Search.Documents.Models.TokenFilter> TokenFilters { get { throw null; } set { } }
-        public System.Collections.Generic.IList<Azure.Search.Documents.Models.Tokenizer> Tokenizers { get { throw null; } set { } }
+        public System.Collections.Generic.IList<Azure.Search.Documents.Models.ScoringProfile> ScoringProfiles { get { throw null; } }
+        public System.Collections.Generic.IList<Azure.Search.Documents.Models.Suggester> Suggesters { get { throw null; } }
+        public System.Collections.Generic.IList<Azure.Search.Documents.Models.TokenFilter> TokenFilters { get { throw null; } }
+        public System.Collections.Generic.IList<Azure.Search.Documents.Models.Tokenizer> Tokenizers { get { throw null; } }
     }
     public partial class SearchIndexer
     {

sdk/search/Azure.Search.Documents/src/Generated/Models/PatternAnalyzer.Serialization.cs

@@ -0,0 +1,41 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System.Collections.Generic;
+using Azure.Core;
+
+namespace Azure.Search.Documents.Models
+{
+    public partial class PatternAnalyzer
+    {
+        [CodeGenMember("flags")]
+        private string FlagsInternal
+        {
+            get => string.Join("|", Flags);
+            set
+            {
+                Flags.Clear();
+
+                if (!string.IsNullOrEmpty(value))
+                {
+                    string[] values = value.Split('|');
+                    for (int i = 0; i < values.Length; ++i)
+                    {
+                        Flags.Add(new RegexFlags(values[i]));
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Gets regular expression flags for <see cref="Pattern"/>.
+        /// </summary>
+        public IList<RegexFlags> Flags { get; } = new List<RegexFlags>();
+
+        /// <summary>
+        /// Gets a list of stopwords.
+        /// </summary>
+        [CodeGenMember(Initialize = true, EmptyAsUndefined = true)]
+        public IList<string> Stopwords { get; }
+    }
+}

sdk/search/Azure.Search.Documents/src/Generated/Models/PatternAnalyzer.cs

@@ -0,0 +1,35 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System.Collections.Generic;
+using Azure.Core;
+
+namespace Azure.Search.Documents.Models
+{
+    public partial class PatternTokenizer
+    {
+        [CodeGenMember("flags")]
+        private string FlagsInternal
+        {
+            get => string.Join("|", Flags);
+            set
+            {
+                Flags.Clear();
+
+                if (!string.IsNullOrEmpty(value))
+                {
+                    string[] values = value.Split('|');
+                    for (int i = 0; i < values.Length; ++i)
+                    {
+                        Flags.Add(new RegexFlags(values[i]));
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Regular expression flags for <see cref="Pattern"/>.
+        /// </summary>
+        public IList<RegexFlags> Flags { get; } = new List<RegexFlags>();
+    }
+}