Index pattern field class refactor (#73180) (#74653)

- Better distinction and relationship between IndexPatternField and its spec
- IndexPatternField class is no longer defined via object mutation
- Reduction of dependencies
- UI code moved into Index Pattern class (will be removed in next ticket)
- IndexPattern field list was previously composed of IndexPatternFields or specs, now only IndexPatternFields
- IndexPattern field list was previously redefined when loading fields, now only its contents are replaced.

Author: mattkime

docs/development/plugins/data/public/kibana-plugin-plugins-data-public.fieldlist._constructor_.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-plugins-data-public](./kibana-plugin-plugins-data-public.md) &gt; [FieldList](./kibana-plugin-plugins-data-public.fieldlist.md) &gt; [(constructor)](./kibana-plugin-plugins-data-public.fieldlist._constructor_.md)
+
+## FieldList.(constructor)
+
+Constructs a new instance of the `FieldList` class
+
+<b>Signature:</b>
+
+```typescript
+constructor(indexPattern: IndexPattern, specs?: FieldSpec[], shortDotsEnable?: boolean, onNotification?: () => void);
+```
+
+## Parameters
+
+|  Parameter | Type | Description |
+|  --- | --- | --- |
+|  indexPattern | <code>IndexPattern</code> |  |
+|  specs | <code>FieldSpec[]</code> |  |
+|  shortDotsEnable | <code>boolean</code> |  |
+|  onNotification | <code>() =&gt; void</code> |  |
+

docs/development/plugins/data/public/kibana-plugin-plugins-data-public.fieldlist.add.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-plugins-data-public](./kibana-plugin-plugins-data-public.md) &gt; [FieldList](./kibana-plugin-plugins-data-public.fieldlist.md) &gt; [add](./kibana-plugin-plugins-data-public.fieldlist.add.md)
+
+## FieldList.add property
+
+<b>Signature:</b>
+
+```typescript
+readonly add: (field: FieldSpec) => void;
+```

docs/development/plugins/data/public/kibana-plugin-plugins-data-public.fieldlist.getbyname.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-plugins-data-public](./kibana-plugin-plugins-data-public.md) &gt; [FieldList](./kibana-plugin-plugins-data-public.fieldlist.md) &gt; [getByName](./kibana-plugin-plugins-data-public.fieldlist.getbyname.md)
+
+## FieldList.getByName property
+
+<b>Signature:</b>
+
+```typescript
+readonly getByName: (name: IndexPatternField['name']) => IndexPatternField | undefined;
+```

docs/development/plugins/data/public/kibana-plugin-plugins-data-public.fieldlist.getbytype.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-plugins-data-public](./kibana-plugin-plugins-data-public.md) &gt; [FieldList](./kibana-plugin-plugins-data-public.fieldlist.md) &gt; [getByType](./kibana-plugin-plugins-data-public.fieldlist.getbytype.md)
+
+## FieldList.getByType property
+
+<b>Signature:</b>
+
+```typescript
+readonly getByType: (type: IndexPatternField['type']) => any[];
+```

docs/development/plugins/data/public/kibana-plugin-plugins-data-public.fieldlist.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-plugins-data-public](./kibana-plugin-plugins-data-public.md) &gt; [FieldList](./kibana-plugin-plugins-data-public.fieldlist.md)
+
+## FieldList class
+
+<b>Signature:</b>
+
+```typescript
+export declare class FieldList extends Array<IndexPatternField> implements IIndexPatternFieldList 
+```
+
+## Constructors
+
+|  Constructor | Modifiers | Description |
+|  --- | --- | --- |
+|  [(constructor)(indexPattern, specs, shortDotsEnable, onNotification)](./kibana-plugin-plugins-data-public.fieldlist._constructor_.md) |  | Constructs a new instance of the <code>FieldList</code> class |
+
+## Properties
+
+|  Property | Modifiers | Type | Description |
+|  --- | --- | --- | --- |
+|  [add](./kibana-plugin-plugins-data-public.fieldlist.add.md) |  | <code>(field: FieldSpec) =&gt; void</code> |  |
+|  [getByName](./kibana-plugin-plugins-data-public.fieldlist.getbyname.md) |  | <code>(name: IndexPatternField['name']) =&gt; IndexPatternField &#124; undefined</code> |  |
+|  [getByType](./kibana-plugin-plugins-data-public.fieldlist.getbytype.md) |  | <code>(type: IndexPatternField['type']) =&gt; any[]</code> |  |
+|  [remove](./kibana-plugin-plugins-data-public.fieldlist.remove.md) |  | <code>(field: IFieldType) =&gt; void</code> |  |
+|  [removeAll](./kibana-plugin-plugins-data-public.fieldlist.removeall.md) |  | <code>() =&gt; void</code> |  |
+|  [replaceAll](./kibana-plugin-plugins-data-public.fieldlist.replaceall.md) |  | <code>(specs: FieldSpec[]) =&gt; void</code> |  |
+|  [toSpec](./kibana-plugin-plugins-data-public.fieldlist.tospec.md) |  | <code>() =&gt; {</code><br/><code>        count: number;</code><br/><code>        script: string &#124; undefined;</code><br/><code>        lang: string &#124; undefined;</code><br/><code>        conflictDescriptions: Record&lt;string, string[]&gt; &#124; undefined;</code><br/><code>        name: string;</code><br/><code>        type: string;</code><br/><code>        esTypes: string[] &#124; undefined;</code><br/><code>        scripted: boolean;</code><br/><code>        searchable: boolean;</code><br/><code>        aggregatable: boolean;</code><br/><code>        readFromDocValues: boolean;</code><br/><code>        subType: import(&quot;../types&quot;).IFieldSubType &#124; undefined;</code><br/><code>        format: any;</code><br/><code>    }[]</code> |  |
+|  [update](./kibana-plugin-plugins-data-public.fieldlist.update.md) |  | <code>(field: FieldSpec) =&gt; void</code> |  |
+

docs/development/plugins/data/public/kibana-plugin-plugins-data-public.fieldlist.remove.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-plugins-data-public](./kibana-plugin-plugins-data-public.md) &gt; [FieldList](./kibana-plugin-plugins-data-public.fieldlist.md) &gt; [remove](./kibana-plugin-plugins-data-public.fieldlist.remove.md)
+
+## FieldList.remove property
+
+<b>Signature:</b>
+
+```typescript
+readonly remove: (field: IFieldType) => void;
+```

docs/development/plugins/data/public/kibana-plugin-plugins-data-public.fieldlist.removeall.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-plugins-data-public](./kibana-plugin-plugins-data-public.md) &gt; [FieldList](./kibana-plugin-plugins-data-public.fieldlist.md) &gt; [removeAll](./kibana-plugin-plugins-data-public.fieldlist.removeall.md)
+
+## FieldList.removeAll property
+
+<b>Signature:</b>
+
+```typescript
+readonly removeAll: () => void;
+```

docs/development/plugins/data/public/kibana-plugin-plugins-data-public.fieldlist.replaceall.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-plugins-data-public](./kibana-plugin-plugins-data-public.md) &gt; [FieldList](./kibana-plugin-plugins-data-public.fieldlist.md) &gt; [replaceAll](./kibana-plugin-plugins-data-public.fieldlist.replaceall.md)
+
+## FieldList.replaceAll property
+
+<b>Signature:</b>
+
+```typescript
+readonly replaceAll: (specs: FieldSpec[]) => void;
+```

docs/development/plugins/data/public/kibana-plugin-plugins-data-public.fieldlist.tospec.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-plugins-data-public](./kibana-plugin-plugins-data-public.md) &gt; [FieldList](./kibana-plugin-plugins-data-public.fieldlist.md) &gt; [toSpec](./kibana-plugin-plugins-data-public.fieldlist.tospec.md)
+
+## FieldList.toSpec property
+
+<b>Signature:</b>
+
+```typescript
+readonly toSpec: () => {
+        count: number;
+        script: string | undefined;
+        lang: string | undefined;
+        conflictDescriptions: Record<string, string[]> | undefined;
+        name: string;
+        type: string;
+        esTypes: string[] | undefined;
+        scripted: boolean;
+        searchable: boolean;
+        aggregatable: boolean;
+        readFromDocValues: boolean;
+        subType: import("../types").IFieldSubType | undefined;
+        format: any;
+    }[];
+```

docs/development/plugins/data/public/kibana-plugin-plugins-data-public.fieldlist.update.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-plugins-data-public](./kibana-plugin-plugins-data-public.md) &gt; [FieldList](./kibana-plugin-plugins-data-public.fieldlist.md) &gt; [update](./kibana-plugin-plugins-data-public.fieldlist.update.md)
+
+## FieldList.update property
+
+<b>Signature:</b>
+
+```typescript
+readonly update: (field: FieldSpec) => void;
+```