[ML] Transforms: Remove index field limitation for custom query. (#81467)

The query bar originally developed for the transforms wizard didn't work with indices with more than 1024 fields. In that case we disabled the query bar and showed an info-callout. Since we moved on to make use of the KQL query bar, this limitation does no longer exist so this PR removes the limitation.

Author: walterra

x-pack/plugins/transform/public/app/sections/create_transform/components/step_define/step_define_form.tsx

@@ -102,11 +102,6 @@ export const StepDefineForm: FC<StepDefineFormProps> = React.memo((props) => {
     toastNotifications,
   };
 
-  // TODO This should use the actual value of `indices.query.bool.max_clause_count`
-  const maxIndexFields = 1024;
-  const numIndexFields = indexPattern.fields.length;
-  const disabledQuery = numIndexFields > maxIndexFields;
-
   const copyToClipboardSource = getIndexDevConsoleStatement(pivotQuery, indexPattern.title);
   const copyToClipboardSourceDescription = i18n.translate(
     'xpack.transform.indexPreview.copyClipboardTooltip',
@@ -181,18 +176,6 @@ export const StepDefineForm: FC<StepDefineFormProps> = React.memo((props) => {
             label={i18n.translate('xpack.transform.stepDefineForm.indexPatternLabel', {
               defaultMessage: 'Index pattern',
             })}
-            helpText={
-              disabledQuery
-                ? i18n.translate('xpack.transform.stepDefineForm.indexPatternHelpText', {
-                    defaultMessage:
-                      'An optional query for this index pattern is not supported. The number of supported index fields is {maxIndexFields} whereas this index has {numIndexFields} fields.',
-                    values: {
-                      maxIndexFields,
-                      numIndexFields,
-                    },
-                  })
-                : ''
-            }
           >
             <span>{indexPattern.title}</span>
           </EuiFormRow>
@@ -214,7 +197,7 @@ export const StepDefineForm: FC<StepDefineFormProps> = React.memo((props) => {
                 {/* Flex Column #1: Search Bar / Advanced Search Editor */}
                 {searchItems.savedSearch === undefined && (
                   <>
-                    {!disabledQuery && !isAdvancedSourceEditorEnabled && (
+                    {!isAdvancedSourceEditorEnabled && (
                       <SourceSearchBar
                         indexPattern={indexPattern}
                         searchBar={stepDefineForm.searchBar}

x-pack/plugins/translations/translations/ja-JP.json

@@ -19774,7 +19774,6 @@
     "xpack.transform.stepDefineForm.groupByExistsErrorMessage": "「{aggName}」という名前のグループ分け構成は既に存在します。",
     "xpack.transform.stepDefineForm.groupByLabel": "グループ分けの条件",
     "xpack.transform.stepDefineForm.groupByPlaceholder": "グループ分けの条件フィールドを追加…",
-    "xpack.transform.stepDefineForm.indexPatternHelpText": "このインデックスパターンのオプションのクエリはサポートされていません。サポートされているインデックスフィールドの数は {maxIndexFields} で、このインデックスには {numIndexFields} 個のフィールドがあります。",
     "xpack.transform.stepDefineForm.indexPatternLabel": "インデックスパターン",
     "xpack.transform.stepDefineForm.invalidKuerySyntaxErrorMessageQueryBar": "無効なクエリ：{errorMessage}",
     "xpack.transform.stepDefineForm.maxSubAggsLevelsLimitMessage": "フォームで追加できる下位集約の最大レベル数に達しました。別のレベルを追加する場合は、JSON構成を編集してください。",

x-pack/plugins/translations/translations/zh-CN.json

@@ -19793,7 +19793,6 @@
     "xpack.transform.stepDefineForm.groupByExistsErrorMessage": "名称为“{aggName}”的分组依据配置已存在。",
     "xpack.transform.stepDefineForm.groupByLabel": "分组依据",
     "xpack.transform.stepDefineForm.groupByPlaceholder": "添加分组依据字段……",
-    "xpack.transform.stepDefineForm.indexPatternHelpText": "不支持此索引模式的可选查询。受支持索引字段数目为 {maxIndexFields}，而此索引有 {numIndexFields} 个字段。",
     "xpack.transform.stepDefineForm.indexPatternLabel": "索引模式",
     "xpack.transform.stepDefineForm.invalidKuerySyntaxErrorMessageQueryBar": "查询无效：{errorMessage}",
     "xpack.transform.stepDefineForm.maxSubAggsLevelsLimitMessage": "您已达到可在表单中添加的最大子聚合级别数。如果想再添加一个级别，请编辑 JSON 配置。",