Remove unused indexPattern:fieldMapping:lookBack advanced setting

docs/management/advanced-options.asciidoc

@@ -62,8 +62,6 @@ mentioned use "\_default_".
 `histogram:maxBars`:: Date histograms are not generated with more bars than the value of this property, scaling values
 when necessary.
 `history:limit`:: In fields that have history, such as query inputs, show this many recent values.
-`indexPattern:fieldMapping:lookBack`:: For index patterns containing timestamps in their names,
-look for this many recent matching patterns from which to query the field mapping.
 `indexPattern:placeholder`:: The default placeholder value to use in Management > Index Patterns > Create Index Pattern.
 `metaFields`:: Fields that exist outside of `_source`. Kibana merges these fields
 into the document when displaying it.

src/legacy/core_plugins/kibana/ui_setting_defaults.js

@@ -690,17 +690,6 @@ export function getUiSettingDefaults() {
           'The maximum height that a cell in a table should occupy. Set to 0 to disable truncation',
       }),
     },
-    'indexPattern:fieldMapping:lookBack': {
-      name: i18n.translate('kbn.advancedSettings.indexPattern.recentMatchingTitle', {
-        defaultMessage: 'Recent matching patterns',
-      }),
-      value: 5,
-      description: i18n.translate('kbn.advancedSettings.indexPattern.recentMatchingText', {
-        defaultMessage:
-          'For index patterns containing timestamps in their names, look for this many recent matching ' +
-          'patterns from which to query the field mapping',
-      }),
-    },
     'format:defaultTypeMap': {
       name: i18n.translate('kbn.advancedSettings.format.defaultTypeMapTitle', {
         defaultMessage: 'Field type format name',

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

@@ -878,8 +878,6 @@
     "kbn.advancedSettings.histogram.maxBarsTitle": "最高バー数",
     "kbn.advancedSettings.historyLimitText": "履歴があるフィールド (例: クエリインプット) に個の数の最近の値が表示されます",
     "kbn.advancedSettings.historyLimitTitle": "履歴制限数",
-    "kbn.advancedSettings.indexPattern.recentMatchingText": "名前にタイムスタンプが含まれているインデックスパターンで、フィールドマッチングをクエリする最近の一致したパターンが、この数検索されます",
-    "kbn.advancedSettings.indexPattern.recentMatchingTitle": "最近一致したパターン",
     "kbn.advancedSettings.indexPatternPlaceholderText": "「管理 > インデックスパターン > インデックスパターンを作成」で使用される「インデックスパターン名」フィールドのプレースホルダーです。",
     "kbn.advancedSettings.indexPatternPlaceholderTitle": "インデックスパターンのプレースホルダー",
     "kbn.advancedSettings.maxBucketsText": "1 つのデータソースが返せるバケットの最大数です",

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

@@ -878,8 +878,6 @@
     "kbn.advancedSettings.histogram.maxBarsTitle": "最大条形数",
     "kbn.advancedSettings.historyLimitText": "在具有历史记录（例如查询输入）的字段中，显示此数目的最近值",
     "kbn.advancedSettings.historyLimitTitle": "历史记录限制",
-    "kbn.advancedSettings.indexPattern.recentMatchingText": "对于名称中包含时间戳的索引模式，寻找此数目的最近匹配模式，以从其中查询字段映射",
-    "kbn.advancedSettings.indexPattern.recentMatchingTitle": "最近匹配模式",
     "kbn.advancedSettings.indexPatternPlaceholderText": "在“管理 > 索引模式 > 创建索引模式”中“索引模式名称”的占位符。",
     "kbn.advancedSettings.indexPatternPlaceholderTitle": "索引模式占位符",
     "kbn.advancedSettings.maxBucketsText": "单个数据源可以返回的最大存储桶数目",