Fix colors of visualizations with more than 10 items (#7051)

* Fix visualizations colors for more than 10 items
---------

Signed-off-by: Eva Millán <evamillan@bitergia.com>
Co-authored-by: opensearch-changeset-bot[bot] <154024398+opensearch-changeset-bot[bot]@users.noreply.github.com>
Co-authored-by: Anan Zhuang <ananzh@amazon.com>
Co-authored-by: Ashwin P Chandran <ashwinpc@amazon.com>

changelogs/fragments/7051.yml

@@ -0,0 +1,2 @@
+fix:
+- Fix colors of the visualizations with more than 10 items ([#7051](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/7051))

src/plugins/charts/public/services/colors/mapped_colors.ts

@@ -106,9 +106,11 @@ export class MappedColors {
     });
 
     // Choose colors from euiPaletteColorBlind and filter out any already assigned to keys
+    const rotations = Math.ceil(keys.length / 10);
     const colorPalette = euiPaletteColorBlind({
-      rotations: Math.ceil(keys.length / 10),
-      direction: 'both',
+      rotations,
+      direction: rotations === 2 ? 'lighter' : 'both',
+      order: rotations > 2 ? 'middle-out' : 'append',
     })
       .filter((color) => !alreadyUsedColors.includes(color.toLowerCase()))
       .slice(0, keysToMap.length);