Support exact match in search

modules/docs/src/Volo.Docs.Domain/Volo/Docs/Documents/FullSearch/Elastic/ElasticDocumentFullSearch.cs

@@ -143,6 +143,27 @@ namespace Volo.Docs.Documents.FullSearch.Elastic
             CancellationToken cancellationToken = default)
         {
             ValidateElasticSearchEnabled();
+            
+            FieldNameQueryBase query;
+            // if context starts with " or ends with " then we search for exact match
+            if (context.StartsWith("\"") && context.EndsWith("\""))
+            {
+                context = context.Trim('"');
+                
+                query = new MatchPhraseQuery
+                {
+                    Query = context
+                };
+            }
+            else
+            {
+                query = new MatchQuery
+                {
+                    Query = context
+                };
+            }
+
+            query.Field = "content";
 
             var request = new SearchRequest
             {
@@ -152,11 +173,7 @@ namespace Volo.Docs.Documents.FullSearch.Elastic
                 {
                     Must = new QueryContainer[]
                     {
-                        new MatchQuery
-                        {
-                            Field = "content",
-                            Query = context
-                        }
+                        query,
                     },
                     Filter = new QueryContainer[]
                     {