Merge branch '2.x' into backport/backport-825-to-2.x

src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/IndexStateManagementHistory.kt

@@ -176,7 +176,7 @@ class IndexStateManagementHistory(
             clusterStateRequest,
             object : ActionListener<ClusterStateResponse> {
                 override fun onResponse(clusterStateResponse: ClusterStateResponse) {
-                    if (!clusterStateResponse.state.metadata.indices.isEmpty) {
+                    if (!clusterStateResponse.state.metadata.indices.isEmpty()) {
                         val indicesToDelete = getIndicesToDelete(clusterStateResponse)
                         logger.info("Deleting old history indices viz $indicesToDelete")
                         deleteAllOldHistoryIndices(indicesToDelete)
@@ -199,7 +199,10 @@ class IndexStateManagementHistory(
             val creationTime = indexMetaData.creationDate
 
             if ((Instant.now().toEpochMilli() - creationTime) > historyRetentionPeriod.millis) {
-                val alias = indexMetaData.aliases.firstOrNull { IndexManagementIndices.HISTORY_WRITE_INDEX_ALIAS == it.value.alias }
+                val alias = indexMetaData.aliases.firstNotNullOfOrNull {
+                        alias ->
+                    IndexManagementIndices.HISTORY_WRITE_INDEX_ALIAS == alias.value.alias
+                }
                 if (alias != null && historyEnabled) {
                     // If index has write alias and history is enable, don't delete the index.
                     continue

src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/ManagedIndexRunner.kt

@@ -262,12 +262,12 @@ object ManagedIndexRunner :
         }
 
         // Check the cluster state for the index metadata
-        var clusterStateIndexMetadata = getIndexMetadata(managedIndexConfig.index)
+        val clusterStateIndexMetadata = getIndexMetadata(managedIndexConfig.index)
         val defaultIndexMetadataService = indexMetadataProvider.services[DEFAULT_INDEX_TYPE] as DefaultIndexMetadataService
         val clusterStateIndexUUID = clusterStateIndexMetadata?.let { defaultIndexMetadataService.getCustomIndexUUID(it) }
         // If the index metadata is null, the index is not in the cluster state. If the index metadata is not null, but
         // the cluster state index uuid differs from the one in the managed index config then the config is referring
-        // to a different index which does not exist in the cluster. We need to check all of the extensions to confirm an index exists
+        // to a different index which does not exist in the cluster. We need to check all the extensions to confirm an index exists
         if (clusterStateIndexMetadata == null || clusterStateIndexUUID != managedIndexConfig.indexUuid) {
             // If the cluster state/default index type didn't have an index with a matching name and uuid combination, try all other index types
             val nonDefaultIndexTypes = indexMetadataProvider.services.keys.filter { it != DEFAULT_INDEX_TYPE }
@@ -846,7 +846,7 @@ object ManagedIndexRunner :
 
             val response: ClusterStateResponse = client.admin().cluster().suspendUntil { state(clusterStateRequest, it) }
 
-            indexMetaData = response.state.metadata.indices.firstOrNull()?.value
+            indexMetaData = response.state.metadata.indices[index]
         } catch (e: Exception) {
             logger.error("Failed to get IndexMetaData from cluster manager cluster state for index=$index", e)
         }

src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/MetadataService.kt

@@ -40,7 +40,7 @@ import java.lang.Exception
  * MetadataService starts to move metadata from cluster state to config index
  */
 @OpenForTesting
-@Suppress("MagicNumber", "ReturnCount", "LongMethod", "ComplexMethod")
+@Suppress("MagicNumber", "ReturnCount", "LongMethod", "ComplexMethod", "NestedBlockDepth")
 class MetadataService(
     private val client: Client,
     private val clusterService: ClusterService,
@@ -111,11 +111,13 @@ class MetadataService(
             val indexUuidMap = mutableMapOf<IndexUuid, IndexName>()
             clusterStateManagedIndexMetadata.forEach { (indexName, metadata) ->
                 val indexMetadata = indicesMetadata[indexName]
-                val currentIndexUuid = indexMetadata.indexUUID
-                if (currentIndexUuid != metadata?.indexUuid) {
-                    corruptManagedIndices.add(indexMetadata.index)
-                } else {
-                    indexUuidMap[currentIndexUuid] = indexName
+                indexMetadata?.let {
+                    val currentIndexUuid = it.indexUUID
+                    if (currentIndexUuid != metadata?.indexUuid) {
+                        corruptManagedIndices.add(it.index)
+                    } else {
+                        indexUuidMap[currentIndexUuid] = indexName
+                    }
                 }
             }
             logger.info("Corrupt managed indices with outdated index uuid in metadata: $corruptManagedIndices")

src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/opensearchapi/OpenSearchExtensions.kt

@@ -199,8 +199,6 @@ fun XContentBuilder.buildMetadata(name: String, metadata: ToXContentFragment, pa
 
 // Get the oldest rollover time or null if index was never rolled over
 fun IndexMetadata.getOldestRolloverTime(): Instant? {
-    return this.rolloverInfos.values()
-        .map { it.value.time }
-        .minOrNull() // oldest should be min as its epoch time
+    return this.rolloverInfos.values.minOfOrNull { it.time } // oldest should be min as its epoch time
         ?.let { Instant.ofEpochMilli(it) }
 }

src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/step/shrink/AttemptMoveShardsStep.kt

@@ -84,7 +84,8 @@ class AttemptMoveShardsStep(private val action: ShrinkAction) : ShrinkStep(name,
         val (statsStore, statsDocs, shardStats) = getIndexStats(indexName, client) ?: return this
         val indexSize = statsStore.sizeInBytes
         // Get stats of current and target shards
-        val numOriginalShards = context.clusterService.state().metadata.indices[indexName].numberOfShards
+        val numOriginalShards = context.clusterService.state().metadata.indices[indexName]?.numberOfShards
+            ?: error("numOriginalShards should not be null")
         val numTargetShards = getNumTargetShards(numOriginalShards, indexSize)
 
         if (shouldFailTooManyDocuments(statsDocs, numTargetShards)) return this
@@ -215,7 +216,7 @@ class AttemptMoveShardsStep(private val action: ShrinkAction) : ShrinkStep(name,
     private fun shouldFailUnsafe(clusterService: ClusterService, indexName: String): Boolean {
         // If forceUnsafe is set and is true, then we don't even need to check the number of replicas
         if (action.forceUnsafe == true) return false
-        val numReplicas = clusterService.state().metadata.indices[indexName].numberOfReplicas
+        val numReplicas = clusterService.state().metadata.indices[indexName]?.numberOfReplicas
         val shouldFailForceUnsafeCheck = numReplicas == 0
         if (shouldFailForceUnsafeCheck) {
             logger.info(UNSAFE_FAILURE_MESSAGE)

src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/step/shrink/WaitForMoveShardsStep.kt

@@ -33,7 +33,8 @@ class WaitForMoveShardsStep(private val action: ShrinkAction) : ShrinkStep(name,
         val numShardsInSync = getNumShardsInSync(shardStats, context.clusterService.state(), indexName)
         val nodeToMoveOnto = localShrinkActionProperties.nodeName
         val numShardsOnNode = getNumShardsWithCopyOnNode(shardStats, context.clusterService.state(), nodeToMoveOnto)
-        val numPrimaryShards = context.clusterService.state().metadata.indices[indexName].numberOfShards
+        val numPrimaryShards = context.clusterService.state().metadata.indices[indexName]?.numberOfShards
+            ?: error("numberOfShards should not be null")
 
         // If a copy of each shard is on the node, and all shards are in sync, move on
         if (numShardsOnNode >= numPrimaryShards && numShardsInSync >= numPrimaryShards) {
@@ -49,16 +50,16 @@ class WaitForMoveShardsStep(private val action: ShrinkAction) : ShrinkStep(name,
 
     // Returns the number of shard IDs where all primary and replicas are in sync
     private fun getNumShardsInSync(shardStats: Array<ShardStats>, state: ClusterState, indexName: String): Int {
-        val numReplicas = state.metadata.indices[indexName].numberOfReplicas
-        val inSyncAllocations = state.metadata.indices[indexName].inSyncAllocationIds
+        val numReplicas = state.metadata.indices[indexName]?.numberOfReplicas ?: error("numberOfReplicas should not be null")
+        val inSyncAllocations = state.metadata.indices[indexName]?.inSyncAllocationIds
         var numShardsInSync = 0
         for (shard: ShardStats in shardStats) {
             val routingInfo = shard.shardRouting
             // Only check primaries so that we only check once for each shardID
             if (routingInfo.primary()) {
                 // All shards must be in sync as it isn't known which shard (replica or primary) will be
                 // moved to the target node and used in the shrink.
-                if (inSyncAllocations[routingInfo.id].size == (numReplicas + 1)) {
+                if (inSyncAllocations?.get(routingInfo.id)?.size == (numReplicas + 1)) {
                     numShardsInSync++
                 }
             }

src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/step/shrink/WaitForShrinkStep.kt

@@ -54,7 +54,7 @@ class WaitForShrinkStep(private val action: ShrinkAction) : ShrinkStep(name, tru
 
     private suspend fun shrinkNotDone(targetIndex: String, targetNumShards: Int, client: Client, clusterService: ClusterService): Boolean {
         val numPrimaryShardsStarted = getNumPrimaryShardsStarted(client, targetIndex)
-        val numPrimaryShards = clusterService.state().metadata.indices[targetIndex].numberOfShards
+        val numPrimaryShards = clusterService.state().metadata.indices[targetIndex]?.numberOfShards
         return numPrimaryShards != targetNumShards || numPrimaryShardsStarted != targetNumShards
     }
 

src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/transport/action/explain/TransportExplainAction.kt

@@ -269,7 +269,7 @@ class TransportExplainAction @Inject constructor(
                     clusterStateRequest,
                     object : ActionListener<ClusterStateResponse> {
                         override fun onResponse(response: ClusterStateResponse) {
-                            val clusterStateIndexMetadatas = response.state.metadata.indices.associate { it.key to it.value }
+                            val clusterStateIndexMetadatas = response.state.metadata.indices
                             getMetadataMap(clusterStateIndexMetadatas, threadContext)
                         }
 

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

@@ -343,9 +343,9 @@ class RollupMapperService(
                 return RollupJobValidationResult.Failure(getMappingsResult.message, getMappingsResult.cause)
         }
 
-        val indexMapping: MappingMetadata = res.mappings[targetIndexResolvedName]
+        val indexMapping: MappingMetadata? = res.mappings[targetIndexResolvedName]
 
-        return if (((indexMapping.sourceAsMap?.get(_META) as Map<*, *>?)?.get(ROLLUPS) as Map<*, *>?)?.containsKey(rollup.id) == true) {
+        return if (((indexMapping?.sourceAsMap?.get(_META) as Map<*, *>?)?.get(ROLLUPS) as Map<*, *>?)?.containsKey(rollup.id) == true) {
             RollupJobValidationResult.Valid
         } else {
             RollupJobValidationResult.Invalid("Rollup job [${rollup.id}] does not exist in rollup index [$targetIndexResolvedName]")

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

@@ -57,9 +57,9 @@ object RollupFieldValueExpressionResolver {
     open class IndexAliasUtils(val clusterService: ClusterService) {
 
         open fun hasAlias(index: String): Boolean {
-            val aliases = this.clusterService.state().metadata().indices.get(index)?.aliases
+            val aliases = this.clusterService.state().metadata().indices[index]?.aliases
             if (aliases != null) {
-                return aliases.size() > 0
+                return aliases.isNotEmpty()
             }
             return false
         }

src/main/kotlin/org/opensearch/indexmanagement/transform/model/Transform.kt

@@ -363,7 +363,9 @@ data class Transform(
                             groups.add(Dimension.parse(xcp))
                         }
                     }
-                    AGGREGATIONS_FIELD -> aggregations = AggregatorFactories.parseAggregators(xcp)
+                    AGGREGATIONS_FIELD -> {
+                        AggregatorFactories.parseAggregators(xcp)?.let { aggregations = it }
+                    }
                     CONTINUOUS_FIELD -> continuous = xcp.booleanValue()
                     USER_FIELD -> {
                         user = if (xcp.currentToken() == Token.VALUE_NULL) null else User.parse(xcp)

src/main/kotlin/org/opensearch/indexmanagement/util/IndexUtils.kt

@@ -80,10 +80,10 @@ class IndexUtils {
             return DEFAULT_SCHEMA_VERSION
         }
 
-        fun shouldUpdateIndex(index: IndexMetadata, newVersion: Long): Boolean {
+        fun shouldUpdateIndex(index: IndexMetadata?, newVersion: Long): Boolean {
             var oldVersion = DEFAULT_SCHEMA_VERSION
 
-            val indexMapping = index.mapping()?.sourceAsMap()
+            val indexMapping = index?.mapping()?.sourceAsMap()
             if (indexMapping != null && indexMapping.containsKey(_META) && indexMapping[_META] is HashMap<*, *>) {
                 val metaData = indexMapping[_META] as HashMap<*, *>
                 if (metaData.containsKey(SCHEMA_VERSION)) {

src/test/kotlin/org/opensearch/indexmanagement/indexstatemanagement/IndexStateManagementIntegTestCase.kt

@@ -109,7 +109,7 @@ abstract class IndexStateManagementIntegTestCase : OpenSearchIntegTestCase() {
 //        return listOf(TestPlugin::class.java)
 //    }
 
-    protected fun getIndexMetadata(indexName: String): IndexMetadata {
+    protected fun getIndexMetadata(indexName: String): IndexMetadata? {
         return client().admin().cluster().prepareState()
             .setIndices(indexName)
             .setMetadata(true).get()

src/test/kotlin/org/opensearch/indexmanagement/indexstatemanagement/MetadataRegressionIT.kt

@@ -70,7 +70,7 @@ class MetadataRegressionIT : IndexStateManagementIntegTestCase() {
         addPolicyToIndex(indexName, policyID)
 
         // put some metadata into cluster state
-        var indexMetadata = getIndexMetadata(indexName)
+        var indexMetadata = getIndexMetadata(indexName)!!
         metadataToClusterState = metadataToClusterState.copy(
             index = indexName,
             indexUuid = indexMetadata.indexUUID,
@@ -85,7 +85,7 @@ class MetadataRegressionIT : IndexStateManagementIntegTestCase() {
             UpdateManagedIndexMetaDataAction.INSTANCE, request
         ).get()
         logger.info(response.isAcknowledged)
-        indexMetadata = getIndexMetadata(indexName)
+        indexMetadata = getIndexMetadata(indexName)!!
         logger.info("check if metadata is saved in cluster state: ${indexMetadata.getCustomData("managed_index_metadata")}")
 
         // TODO increase wait time since flaky seeing here. After looking through the log
@@ -102,7 +102,7 @@ class MetadataRegressionIT : IndexStateManagementIntegTestCase() {
                 "Happy moving",
                 getExplainManagedIndexMetaData(indexName).info?.get("message")
             )
-            assertEquals(null, getIndexMetadata(indexName).getCustomData("managed_index_metadata"))
+            assertEquals(null, getIndexMetadata(indexName)!!.getCustomData("managed_index_metadata"))
         }
 
         logger.info("metadata has moved")
@@ -156,7 +156,7 @@ class MetadataRegressionIT : IndexStateManagementIntegTestCase() {
         logger.info("managed-index: ${getExistingManagedIndexConfig(indexName)}")
 
         // manually save metadata into cluster state
-        var indexMetadata = getIndexMetadata(indexName)
+        var indexMetadata = getIndexMetadata(indexName)!!
         metadataToClusterState = metadataToClusterState.copy(
             index = indexName,
             indexUuid = indexMetadata.indexUUID,
@@ -172,7 +172,7 @@ class MetadataRegressionIT : IndexStateManagementIntegTestCase() {
         ).get()
 
         logger.info(response.isAcknowledged)
-        indexMetadata = getIndexMetadata(indexName)
+        indexMetadata = getIndexMetadata(indexName)!!
         logger.info("check if metadata is saved in cluster state: ${indexMetadata.getCustomData("managed_index_metadata")}")
 
         waitFor {
@@ -187,7 +187,7 @@ class MetadataRegressionIT : IndexStateManagementIntegTestCase() {
                 "Happy moving",
                 getExplainManagedIndexMetaData(indexName).info?.get("message")
             )
-            assertEquals(null, getIndexMetadata(indexName).getCustomData("managed_index_metadata"))
+            assertEquals(null, getIndexMetadata(indexName)!!.getCustomData("managed_index_metadata"))
         }
 
         logger.info("metadata has moved")
@@ -225,7 +225,7 @@ class MetadataRegressionIT : IndexStateManagementIntegTestCase() {
         addPolicyToIndex(indexName, policyID)
 
         // put some metadata into cluster state
-        val indexMetadata = getIndexMetadata(indexName)
+        val indexMetadata = getIndexMetadata(indexName)!!
         metadataToClusterState = metadataToClusterState.copy(
             index = indexName,
             indexUuid = "randomindexuuid",
@@ -237,7 +237,7 @@ class MetadataRegressionIT : IndexStateManagementIntegTestCase() {
             )
         )
         client().execute(UpdateManagedIndexMetaDataAction.INSTANCE, request).get()
-        logger.info("check if metadata is saved in cluster state: ${getIndexMetadata(indexName).getCustomData("managed_index_metadata")}")
+        logger.info("check if metadata is saved in cluster state: ${getIndexMetadata(indexName)!!.getCustomData("managed_index_metadata")}")
 
         waitFor {
             assertEquals(
@@ -248,7 +248,7 @@ class MetadataRegressionIT : IndexStateManagementIntegTestCase() {
 
         waitFor(Instant.ofEpochSecond(120)) {
             assertEquals(null, getExplainManagedIndexMetaData(indexName).info?.get("message"))
-            assertEquals(null, getIndexMetadata(indexName).getCustomData("managed_index_metadata"))
+            assertEquals(null, getIndexMetadata(indexName)!!.getCustomData("managed_index_metadata"))
         }
 
         logger.info("corrupt metadata has been cleaned")

src/test/kotlin/org/opensearch/indexmanagement/indexstatemanagement/MetadataServiceTests.kt

@@ -22,7 +22,6 @@ import org.opensearch.client.ClusterAdminClient
 import org.opensearch.cluster.ClusterState
 import org.opensearch.cluster.metadata.Metadata
 import org.opensearch.cluster.service.ClusterService
-import org.opensearch.common.collect.ImmutableOpenMap
 import org.opensearch.indexmanagement.IndexManagementIndices
 import org.opensearch.test.OpenSearchTestCase
 import kotlin.test.assertFailsWith
@@ -40,7 +39,7 @@ class MetadataServiceTests : OpenSearchTestCase() {
     fun setup() {
         whenever(clusterService.state()).doReturn(clusterState)
         whenever(clusterState.metadata).doReturn(metadata)
-        whenever(metadata.indices).doReturn(ImmutableOpenMap.of())
+        whenever(metadata.indices).doReturn(mapOf())
     }
 
     fun `test config index not exists`() = runBlocking {

src/test/kotlin/org/opensearch/indexmanagement/indexstatemanagement/step/AttemptTransitionStepTests.kt

@@ -23,7 +23,6 @@ import org.opensearch.cluster.ClusterState
 import org.opensearch.cluster.metadata.IndexMetadata
 import org.opensearch.cluster.metadata.Metadata
 import org.opensearch.cluster.service.ClusterService
-import org.opensearch.common.collect.ImmutableOpenMap
 import org.opensearch.common.settings.ClusterSettings
 import org.opensearch.common.settings.Settings
 import org.opensearch.index.shard.DocsStats
@@ -50,7 +49,7 @@ class AttemptTransitionStepTests : OpenSearchTestCase() {
     private val indexUUID: String = "indexUuid"
     @Suppress("UNCHECKED_CAST")
     private val indexMetadata: IndexMetadata = mock {
-        on { rolloverInfos } doReturn ImmutableOpenMap.builder<String, RolloverInfo>().build()
+        on { rolloverInfos } doReturn mapOf<String, RolloverInfo>()
         on { indexUUID } doReturn indexUUID
     }
     private val metadata: Metadata = mock {