[8.x] [data views] Remove regex for creating dot notation (#193795) (#…

…193809)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[data views] Remove regex for creating dot notation
(#193795)](#193795)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Matthew
Kime","email":"matt@mattki.me"},"sourceCommit":{"committedDate":"2024-09-24T00:30:52Z","message":"[data
views] Remove regex for creating dot notation (#193795)\n\n##
Summary\r\n\r\nUse basic string and array functions instead of regex to
create short\r\ndot field
names.","sha":"ab9459ca4358451614c3b4fb09380af9841e7a66","branchLabelMapping":{"^v9.0.0$":"main","^v8.16.0$":"8.x","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["Feature:Data
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views] Remove regex for creating dot
notation","number":193795,"url":"https://github.com/elastic/kibana/pull/193795","mergeCommit":{"message":"[data
views] Remove regex for creating dot notation (#193795)\n\n##
Summary\r\n\r\nUse basic string and array functions instead of regex to
create short\r\ndot field
names.","sha":"ab9459ca4358451614c3b4fb09380af9841e7a66"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v9.0.0","branchLabelMappingKey":"^v9.0.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/193795","number":193795,"mergeCommit":{"message":"[data
views] Remove regex for creating dot notation (#193795)\n\n##
Summary\r\n\r\nUse basic string and array functions instead of regex to
create short\r\ndot field
names.","sha":"ab9459ca4358451614c3b4fb09380af9841e7a66"}}]}]
BACKPORT-->

Co-authored-by: Matthew Kime <matt@mattki.me>

src/plugins/data_views/common/fields/utils.ts

@@ -26,14 +26,22 @@ export const isMultiField = isDataViewFieldSubtypeMulti;
 export const getFieldSubtypeMulti = getDataViewFieldSubtypeMulti;
 export const getFieldSubtypeNested = getDataViewFieldSubtypeNested;
 
-const DOT_PREFIX_RE = /(.).+?\./g;
-
 /**
  * Convert a dot.notated.string into a short
  * version (d.n.string)
  */
 export function shortenDottedString(input: string): string {
-  return typeof input !== 'string' ? input : input.replace(DOT_PREFIX_RE, '$1.');
+  if (typeof input === 'string') {
+    const split = input.split('.');
+    return split.reduce((acc, part, i) => {
+      if (i === split.length - 1) {
+        return acc + part;
+      }
+      return acc + part[0] + '.';
+    }, '');
+  }
+
+  return input;
 }
 
 // Note - this code is duplicated from @kbn/es-query