* added support for mustache scripting of rollup.target_index field

* defekt fixes
* tests
* small refactor/improvements
* added wildcard check when creating rollup job; removed resolving targetIndex on Rollup init; added test for wildcards
* lint fixes
* moved target_index validation in getRollup resp handler
* added using toMap()
* exception fix
* linter fix
* fixed IT fail
* added Exception catch block

Signed-off-by: Petar Dzepina <petar.dzepina@gmail.com>

Author: petardz

src/test/kotlin/org/opensearch/indexmanagement/rollup/util/RollupFieldValueExpressionResolverTests.kt

@@ -23,10 +23,10 @@ class RollupFieldValueExpressionResolverTests : OpenSearchTestCase() {
     private val scriptService: ScriptService = mock()
     private val clusterService: ClusterService = mock()
     private val indexAliasUtils: RollupFieldValueExpressionResolver.IndexAliasUtils = mock()
+
     @Before
     fun settings() {
         RollupFieldValueExpressionResolver.registerServices(scriptService, clusterService)
-        clusterService.state()
     }
 
     fun `test resolving no alias successfully`() {