fix(flexSearch): use correct analyzer when using searchExpression with case-insensitive identity fields

Author: mfusser

spec/regression/logistics/tests/flex-search.graphql

@@ -42,6 +42,12 @@ query equals_null {
 }
 
 query expression {
+    flexSearchDeliveries(flexSearchExpression: "10005") {
+        deliveryNumber
+    }
+}
+
+query expressionFulltext {
     flexSearchDeliveries(flexSearchExpression: "all") {
         deliveryNumber
     }

spec/regression/logistics/tests/flex-search.result.json

@@ -68,6 +68,19 @@
   "expression": {
     "data": {
       "flexSearchDeliveries": [
+        {
+          "deliveryNumber": "1000521"
+        },
+        {
+          "deliveryNumber": "1000522"
+        }
+      ]
+    }
+  },
+  "expressionFulltext": {
+    "data": {
+      "flexSearchDeliveries": [
+
         {
           "deliveryNumber": "1000173"
         },

src/schema-generation/flex-search-generator.ts

@@ -1,5 +1,6 @@
 import { GraphQLFieldConfigArgumentMap, GraphQLString } from 'graphql';
 import { Field, RootEntityType } from '../model/implementation';
+import { IDENTITY_ANALYZER, NORM_CI_ANALYZER } from '../model/implementation/flex-search';
 import {
     BinaryOperationQueryNode,
     BinaryOperator,
@@ -272,6 +273,7 @@ export class FlexSearchGenerator {
             const identityNode = new FlexSearchStartsWithQueryNode(
                 new FieldPathQueryNode(itemVariable, path.concat(field)),
                 new LiteralQueryNode(expression),
+                field.isFlexSearchIndexCaseSensitive ? IDENTITY_ANALYZER : NORM_CI_ANALYZER
             );
             const fullTextQueryNode = new FlexSearchComplexOperatorQueryNode(
                 expression,