{index} can be one or many indices and should be typed to list.

Mpdreamz · Mpdreamz · commit fcd8606f9805 · 2015-09-21T17:38:10.000+02:00
diff --git a/rest-api-spec/src/main/resources/rest-api-spec/api/cluster.health.json b/rest-api-spec/src/main/resources/rest-api-spec/api/cluster.health.json
@@ -7,7 +7,7 @@
       "paths": ["/_cluster/health", "/_cluster/health/{index}"],
       "parts": {
         "index": {
-          "type" : "string",
+          "type" : "list",
           "description" : "Limit the information returned to a specific index"
         }
       },

Original file line number	Diff line number	Diff line change
`@@ -7,7 +7,7 @@`
`7`	`7`	`"paths": ["/_cluster/health", "/_cluster/health/{index}"],`
`8`	`8`	`"parts": {`
`9`	`9`	`"index": {`
`10`		`- "type" : "string",`
	`10`	`+ "type" : "list",`
`11`	`11`	`"description" : "Limit the information returned to a specific index"`
`12`	`12`	`}`
`13`	`13`	`},`