fix: ast normalize comments and add test for implicit OR operator fre…

…e-text expressions

services/search/pkg/query/kql/normalize.go

@@ -13,7 +13,7 @@ var operatorNodeOr = ast.OperatorNode{Base: &ast.Base{Loc: &ast.Location{Source:
 // https://learn.microsoft.com/en-us/sharepoint/dev/general-development/keyword-query-language-kql-syntax-reference#constructing-free-text-queries-using-kql
 // If there are multiple free-text expressions without any operators in between them, the query behavior is the same as using the AND operator.
 // "John Smith" "Jane Smith"
-// This functionally is the same as using the OR Boolean operator, as follows:
+// This functionally is the same as using the AND Boolean operator, as follows:
 // "John Smith" AND "Jane Smith"
 //
 // https://learn.microsoft.com/en-us/sharepoint/dev/general-development/keyword-query-language-kql-syntax-reference#using-multiple-property-restrictions-within-a-kql-query

services/search/pkg/query/kql/normalize_test.go

@@ -37,6 +37,18 @@ func TestNormalizeNodes(t *testing.T) {
 				&ast.StringNode{Key: "author", Value: "Jane Smith"},
 			},
 		},
+		{
+			name: "no key explicit AND",
+			givenNodes: []ast.Node{
+				&ast.StringNode{Value: "John Smith"},
+				&ast.StringNode{Value: "Jane Smith"},
+			},
+			expectedNodes: []ast.Node{
+				&ast.StringNode{Value: "John Smith"},
+				&ast.OperatorNode{Value: "AND"},
+				&ast.StringNode{Value: "Jane Smith"},
+			},
+		},
 		{
 			name: "same key explicit AND",
 			givenNodes: []ast.Node{