Make index settings blocks stringified (#2111) (#2112)

* Make index settings blocks stringified

* Update stack version in build validation step

---------

Co-authored-by: Steve Gordon <[email protected]>
Co-authored-by: Laurent Saint-Félix <[email protected]>

Author: 3 people

.github/workflows/validate-pr.yml

@@ -18,7 +18,7 @@ jobs:
     if: github.repository_owner == 'elastic' # this action will fail if executed from a fork
     runs-on: ubuntu-latest
     env:
-      STACK_VERSION: 8.6-SNAPSHOT
+      STACK_VERSION: 8.9-SNAPSHOT
 
     steps:
       - uses: actions/checkout@v2

output/schema/schema.json

@@ -243,10 +243,10 @@ export class SettingsQueryString {
 }
 
 export class IndexSettingBlocks {
-  read_only?: boolean
-  read_only_allow_delete?: boolean
-  read?: boolean
-  write?: boolean | string // TODO: should be bool only
+  read_only?: Stringified<boolean>
+  read_only_allow_delete?: Stringified<boolean>
+  read?: Stringified<boolean>
+  write?: Stringified<boolean>
   metadata?: Stringified<boolean>
 }