added support for mustache scripting of rollup.target_index field

src/main/kotlin/org/opensearch/indexmanagement/IndexManagementPlugin.kt

@@ -110,6 +110,7 @@ import org.opensearch.indexmanagement.rollup.resthandler.RestStartRollupAction
 import org.opensearch.indexmanagement.rollup.resthandler.RestStopRollupAction
 import org.opensearch.indexmanagement.rollup.settings.LegacyOpenDistroRollupSettings
 import org.opensearch.indexmanagement.rollup.settings.RollupSettings
+import org.opensearch.indexmanagement.rollup.util.RollupFieldValueExpressionResolver
 import org.opensearch.indexmanagement.settings.IndexManagementSettings
 import org.opensearch.indexmanagement.snapshotmanagement.api.resthandler.RestCreateSMPolicyHandler
 import org.opensearch.indexmanagement.snapshotmanagement.api.resthandler.RestDeleteSMPolicyHandler
@@ -370,6 +371,7 @@ class IndexManagementPlugin : JobSchedulerExtension, NetworkPlugin, ActionPlugin
         this.indexNameExpressionResolver = indexNameExpressionResolver
 
         val skipFlag = SkipExecution(client, clusterService)
+        RollupFieldValueExpressionResolver.registerScriptService(scriptService)
         val rollupRunner = RollupRunner
             .registerClient(client)
             .registerClusterService(clusterService)

src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/step/rollup/AttemptCreateRollupJobStep.kt

@@ -7,6 +7,7 @@ package org.opensearch.indexmanagement.indexstatemanagement.step.rollup
 
 import org.apache.logging.log4j.LogManager
 import org.opensearch.ExceptionsHelper
+import org.opensearch.OpenSearchException
 import org.opensearch.action.support.WriteRequest
 import org.opensearch.action.support.master.AcknowledgedResponse
 import org.opensearch.index.engine.VersionConflictEngineException
@@ -62,7 +63,9 @@ class AttemptCreateRollupJobStep(private val action: RollupAction) : Step(name)
             }
         } catch (e: RemoteTransportException) {
             processFailure(rollup.id, indexName, ExceptionsHelper.unwrapCause(e) as Exception)
-        } catch (e: RemoteTransportException) {
+        } catch (e: OpenSearchException) {
+            processFailure(rollup.id, indexName, e)
+        } catch (e: Exception) {
             processFailure(rollup.id, indexName, e)
         }
 

src/main/kotlin/org/opensearch/indexmanagement/rollup/RollupIndexer.kt

@@ -23,6 +23,7 @@ import org.opensearch.indexmanagement.rollup.model.Rollup
 import org.opensearch.indexmanagement.rollup.model.RollupStats
 import org.opensearch.indexmanagement.rollup.settings.RollupSettings.Companion.ROLLUP_INGEST_BACKOFF_COUNT
 import org.opensearch.indexmanagement.rollup.settings.RollupSettings.Companion.ROLLUP_INGEST_BACKOFF_MILLIS
+import org.opensearch.indexmanagement.rollup.util.RollupFieldValueExpressionResolver
 import org.opensearch.indexmanagement.rollup.util.getInitialDocValues
 import org.opensearch.indexmanagement.util.IndexUtils.Companion.ODFE_MAGIC_NULL
 import org.opensearch.indexmanagement.util.IndexUtils.Companion.hashToFixedSize
@@ -123,7 +124,8 @@ class RollupIndexer(
                 }
             }
             mapOfKeyValues.putAll(aggResults)
-            val indexRequest = IndexRequest(job.targetIndex)
+            val targetIndexResolvedName = RollupFieldValueExpressionResolver.resolve(job, job.targetIndex)
+            val indexRequest = IndexRequest(targetIndexResolvedName)
                 .id(documentId)
                 .source(mapOfKeyValues, XContentType.JSON)
             requests.add(indexRequest)

src/main/kotlin/org/opensearch/indexmanagement/rollup/RollupMapperService.kt

@@ -32,6 +32,7 @@ import org.opensearch.indexmanagement.rollup.model.Rollup
 import org.opensearch.indexmanagement.rollup.model.RollupJobValidationResult
 import org.opensearch.indexmanagement.rollup.settings.LegacyOpenDistroRollupSettings
 import org.opensearch.indexmanagement.rollup.settings.RollupSettings
+import org.opensearch.indexmanagement.rollup.util.RollupFieldValueExpressionResolver
 import org.opensearch.indexmanagement.rollup.util.isRollupIndex
 import org.opensearch.indexmanagement.util.IndexUtils.Companion._META
 import org.opensearch.indexmanagement.util.IndexUtils.Companion.getFieldFromMappings
@@ -52,14 +53,14 @@ class RollupMapperService(
     // If the index already exists we need to verify it's a rollup index,
     // confirm it does not conflict with existing jobs and is a valid job
     @Suppress("ReturnCount")
-    private suspend fun validateAndAttemptToUpdateTargetIndex(rollup: Rollup): RollupJobValidationResult {
-        if (!isRollupIndex(rollup.targetIndex, clusterService.state())) {
-            return RollupJobValidationResult.Invalid("Target index [${rollup.targetIndex}] is a non rollup index")
+    private suspend fun validateAndAttemptToUpdateTargetIndex(rollup: Rollup, targetIndexResolvedName: String): RollupJobValidationResult {
+        if (!isRollupIndex(targetIndexResolvedName, clusterService.state())) {
+            return RollupJobValidationResult.Invalid("Target index [$targetIndexResolvedName] is a non rollup index")
         }
 
-        return when (val jobExistsResult = jobExistsInRollupIndex(rollup)) {
+        return when (val jobExistsResult = jobExistsInRollupIndex(rollup, targetIndexResolvedName)) {
             is RollupJobValidationResult.Valid -> jobExistsResult
-            is RollupJobValidationResult.Invalid -> updateRollupIndexMappings(rollup)
+            is RollupJobValidationResult.Invalid -> updateRollupIndexMappings(rollup, targetIndexResolvedName)
             is RollupJobValidationResult.Failure -> jobExistsResult
         }
     }
@@ -69,14 +70,15 @@ class RollupMapperService(
     // TODO: error handling
     @Suppress("ReturnCount")
     suspend fun attemptCreateRollupTargetIndex(job: Rollup, hasLegacyPlugin: Boolean): RollupJobValidationResult {
-        if (indexExists(job.targetIndex)) {
-            return validateAndAttemptToUpdateTargetIndex(job)
+        val targetIndexResolvedName = RollupFieldValueExpressionResolver.resolve(job, job.targetIndex)
+        if (indexExists(targetIndexResolvedName)) {
+            return validateAndAttemptToUpdateTargetIndex(job, targetIndexResolvedName)
         } else {
-            val errorMessage = "Failed to create target index [${job.targetIndex}]"
+            val errorMessage = "Failed to create target index [$targetIndexResolvedName]"
             return try {
-                val response = createTargetIndex(job, hasLegacyPlugin)
+                val response = createTargetIndex(targetIndexResolvedName, hasLegacyPlugin)
                 if (response.isAcknowledged) {
-                    updateRollupIndexMappings(job)
+                    updateRollupIndexMappings(job, targetIndexResolvedName)
                 } else {
                     RollupJobValidationResult.Failure(errorMessage)
                 }
@@ -94,13 +96,13 @@ class RollupMapperService(
         }
     }
 
-    private suspend fun createTargetIndex(job: Rollup, hasLegacyPlugin: Boolean): CreateIndexResponse {
+    private suspend fun createTargetIndex(targetIndexName: String, hasLegacyPlugin: Boolean): CreateIndexResponse {
         val settings = if (hasLegacyPlugin) {
             Settings.builder().put(LegacyOpenDistroRollupSettings.ROLLUP_INDEX.key, true).build()
         } else {
             Settings.builder().put(RollupSettings.ROLLUP_INDEX.key, true).build()
         }
-        val request = CreateIndexRequest(job.targetIndex)
+        val request = CreateIndexRequest(targetIndexName)
             .settings(settings)
             .mapping(IndexManagementIndices.rollupTargetMappings)
         // TODO: Perhaps we can do better than this for mappings... as it'll be dynamic for rest
@@ -204,19 +206,19 @@ class RollupMapperService(
         return field != null
     }
 
-    private suspend fun jobExistsInRollupIndex(rollup: Rollup): RollupJobValidationResult {
-        val res = when (val getMappingsResult = getMappings(rollup.targetIndex)) {
+    private suspend fun jobExistsInRollupIndex(rollup: Rollup, targetIndexResolvedName: String): RollupJobValidationResult {
+        val res = when (val getMappingsResult = getMappings(targetIndexResolvedName)) {
             is GetMappingsResult.Success -> getMappingsResult.response
             is GetMappingsResult.Failure ->
                 return RollupJobValidationResult.Failure(getMappingsResult.message, getMappingsResult.cause)
         }
 
-        val indexMapping: MappingMetadata = res.mappings[rollup.targetIndex]
+        val indexMapping: MappingMetadata = res.mappings[targetIndexResolvedName]
 
         return if (((indexMapping.sourceAsMap?.get(_META) as Map<*, *>?)?.get(ROLLUPS) as Map<*, *>?)?.containsKey(rollup.id) == true) {
             RollupJobValidationResult.Valid
         } else {
-            RollupJobValidationResult.Invalid("Rollup job [${rollup.id}] does not exist in rollup index [${rollup.targetIndex}]")
+            RollupJobValidationResult.Invalid("Rollup job [${rollup.id}] does not exist in rollup index [$targetIndexResolvedName]")
         }
     }
 
@@ -254,8 +256,8 @@ class RollupMapperService(
     //   where they can both get the same mapping state and only add their own job, meaning one
     //   of the jobs won't be added to the target index _meta
     @Suppress("BlockingMethodInNonBlockingContext", "ReturnCount")
-    private suspend fun updateRollupIndexMappings(rollup: Rollup): RollupJobValidationResult {
-        val errorMessage = "Failed to update mappings of target index [${rollup.targetIndex}] with rollup job"
+    private suspend fun updateRollupIndexMappings(rollup: Rollup, targetIndexResolvedName: String): RollupJobValidationResult {
+        val errorMessage = "Failed to update mappings of target index [$targetIndexResolvedName] with rollup job"
         try {
             val response = withContext(Dispatchers.IO) {
                 val resp: AcknowledgedResponse = client.suspendUntil {

src/main/kotlin/org/opensearch/indexmanagement/rollup/action/index/TransportIndexRollupAction.kt

@@ -28,6 +28,7 @@ import org.opensearch.commons.authuser.User
 import org.opensearch.indexmanagement.IndexManagementIndices
 import org.opensearch.indexmanagement.IndexManagementPlugin.Companion.INDEX_MANAGEMENT_INDEX
 import org.opensearch.indexmanagement.rollup.model.Rollup
+import org.opensearch.indexmanagement.rollup.util.RollupFieldValueExpressionResolver
 import org.opensearch.indexmanagement.rollup.util.parseRollup
 import org.opensearch.indexmanagement.settings.IndexManagementSettings
 import org.opensearch.indexmanagement.util.IndexUtils
@@ -91,6 +92,14 @@ class TransportIndexRollupAction @Inject constructor(
             if (response.isAcknowledged) {
                 log.info("Successfully created or updated $INDEX_MANAGEMENT_INDEX with newest mappings.")
                 if (request.opType() == DocWriteRequest.OpType.CREATE) {
+                    if (!validateTargetIndexName()) {
+                        return actionListener.onFailure(
+                            OpenSearchStatusException(
+                                "target_index value is invalid: ${request.rollup.targetIndex}",
+                                RestStatus.BAD_REQUEST
+                            )
+                        )
+                    }
                     putRollup()
                 } else {
                     getRollup()
@@ -128,6 +137,14 @@ class TransportIndexRollupAction @Inject constructor(
             if (modified.isNotEmpty()) {
                 return actionListener.onFailure(OpenSearchStatusException("Not allowed to modify $modified", RestStatus.BAD_REQUEST))
             }
+            if (!validateTargetIndexName()) {
+                return actionListener.onFailure(
+                    OpenSearchStatusException(
+                        "target_index value is invalid: ${request.rollup.targetIndex}",
+                        RestStatus.BAD_REQUEST
+                    )
+                )
+            }
             putRollup()
         }
 
@@ -172,5 +189,10 @@ class TransportIndexRollupAction @Inject constructor(
                 }
             )
         }
+
+        private fun validateTargetIndexName(): Boolean {
+            val targetIndexResolvedName = RollupFieldValueExpressionResolver.resolve(request.rollup, request.rollup.targetIndex)
+            return targetIndexResolvedName.contains("*") == false && targetIndexResolvedName.contains("?") == false
+        }
     }
 }

src/main/kotlin/org/opensearch/indexmanagement/rollup/action/mapping/TransportUpdateRollupMappingAction.kt

@@ -25,6 +25,7 @@ import org.opensearch.common.xcontent.XContentFactory
 import org.opensearch.common.xcontent.XContentHelper
 import org.opensearch.common.xcontent.XContentType
 import org.opensearch.indexmanagement.indexstatemanagement.util.XCONTENT_WITHOUT_TYPE
+import org.opensearch.indexmanagement.rollup.util.RollupFieldValueExpressionResolver
 import org.opensearch.indexmanagement.util.IndexUtils.Companion._META
 import org.opensearch.threadpool.ThreadPool
 import org.opensearch.transport.TransportService
@@ -50,7 +51,8 @@ class TransportUpdateRollupMappingAction @Inject constructor(
     private val log = LogManager.getLogger(javaClass)
 
     override fun checkBlock(request: UpdateRollupMappingRequest, state: ClusterState): ClusterBlockException? {
-        return state.blocks.indicesBlockedException(ClusterBlockLevel.METADATA_WRITE, arrayOf(request.rollup.targetIndex))
+        val targetIndexResolvedName = RollupFieldValueExpressionResolver.resolve(request.rollup, request.rollup.targetIndex)
+        return state.blocks.indicesBlockedException(ClusterBlockLevel.METADATA_WRITE, arrayOf(targetIndexResolvedName))
     }
 
     @Suppress("ReturnCount", "LongMethod")
@@ -59,7 +61,8 @@ class TransportUpdateRollupMappingAction @Inject constructor(
         state: ClusterState,
         listener: ActionListener<AcknowledgedResponse>
     ) {
-        val index = state.metadata.index(request.rollup.targetIndex)
+        val targetIndexResolvedName = RollupFieldValueExpressionResolver.resolve(request.rollup, request.rollup.targetIndex)
+        val index = state.metadata.index(targetIndexResolvedName)
         if (index == null) {
             log.debug("Could not find index [$index]")
             return listener.onFailure(IllegalStateException("Could not find index [$index]"))
@@ -113,7 +116,7 @@ class TransportUpdateRollupMappingAction @Inject constructor(
         }
 
         // TODO: Does schema_version get overwritten?
-        val putMappingRequest = PutMappingRequest(request.rollup.targetIndex).source(metaMappings)
+        val putMappingRequest = PutMappingRequest(targetIndexResolvedName).source(metaMappings)
         client.admin().indices().putMapping(
             putMappingRequest,
             object : ActionListener<AcknowledgedResponse> {

src/main/kotlin/org/opensearch/indexmanagement/rollup/util/RollupFieldValueExpressionResolver.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.opensearch.indexmanagement.rollup.util
+
+import org.opensearch.common.xcontent.XContentFactory
+import org.opensearch.indexmanagement.indexstatemanagement.util.XCONTENT_WITHOUT_TYPE
+import org.opensearch.indexmanagement.opensearchapi.toMap
+import org.opensearch.indexmanagement.rollup.model.Rollup
+import org.opensearch.script.Script
+import org.opensearch.script.ScriptService
+import org.opensearch.script.ScriptType
+import org.opensearch.script.TemplateScript
+
+object RollupFieldValueExpressionResolver {
+
+    private val validTopContextFields = setOf(Rollup.SOURCE_INDEX_FIELD)
+
+    private lateinit var scriptService: ScriptService
+
+    fun resolve(rollup: Rollup, fieldValue: String): String {
+        val script = Script(ScriptType.INLINE, Script.DEFAULT_TEMPLATE_LANG, fieldValue, mapOf())
+
+        val contextMap = rollup.toXContent(XContentFactory.jsonBuilder(), XCONTENT_WITHOUT_TYPE)
+            .toMap()
+            .filterKeys { key -> key in validTopContextFields }
+
+        val compiledValue = scriptService.compile(script, TemplateScript.CONTEXT)
+            .newInstance(script.params + mapOf("ctx" to contextMap))
+            .execute()
+
+        return if (compiledValue.isBlank()) fieldValue else compiledValue
+    }
+
+    fun registerScriptService(scriptService: ScriptService) {
+        this.scriptService = scriptService
+    }
+}