Use correct type for Significant Terms Agg (#1556) (#1575)

* Use correct type

* fresh contrib

Co-authored-by: Philip Krauss <[email protected]>

Author: github-actions[bot]

output/schema/schema.json

@@ -310,7 +310,7 @@ export class SignificantTermsAggregation extends BucketAggregationBase {
   execution_hint?: TermsAggregationExecutionHint
   field?: Field
   gnd?: GoogleNormalizedDistanceHeuristic
-  include?: string | string[]
+  include?: TermsInclude
   min_doc_count?: long
   mutual_information?: MutualInformationHeuristic
   percentage?: PercentageScoreHeuristic