diff --git a/elastic/core/src/main/scala/Evolver.scala b/elastic/core/src/main/scala/Evolver.scala
index a11282e..12eda11 100644
--- a/elastic/core/src/main/scala/Evolver.scala
+++ b/elastic/core/src/main/scala/Evolver.scala
@@ -12,12 +12,12 @@ import com.sksamuel.elastic4s.streams.ReactiveElastic._
 import com.sksamuel.elastic4s.{ElasticClient, RequestFailure, RequestSuccess}
 import io.circe.Codec
 import io.circe.generic.extras.semiauto.deriveConfiguredCodec
-import Evolver.Command.{AddMappings, AliasUpdated, BatchUpdatesFinished, CheckTaskCompletion, DocumentsEvolved, EvolveDocuments, EvolveNextIndex, IndexMigrated, IndexMigrationFailed, IndexMigrationStarted, MappingsAdded, MigrateIndex, MigrateIndices, MigrateNextIndex, OldIndexDeleted, RunBatchUpdates, TaskStatus}
 import net.sc8s.akka.circe.CirceSerializer
 import net.sc8s.akka.components.ClusterComponent
 import net.sc8s.akka.stream.RateLogger
 import net.sc8s.circe.CodecConfiguration._
-import net.sc8s.elastic.Evolver.Command.{AliasUpdated, BatchUpdatesFinished, OldIndexDeleted, TaskStatus}
+import net.sc8s.elastic.Evolver.Command.{AddMappings, AliasUpdated, BatchUpdatesFinished, CheckTaskCompletion, DocumentsEvolved, EvolveDocuments, EvolveNextIndex, IndexMigrated, IndexMigrationFailed, IndexMigrationStarted, IndexSettingsUpdated, MappingsAdded, MigrateIndex, MigrateIndices, MigrateNextIndex, OldIndexDeleted, RunBatchUpdates, TaskStatus, UpdateIndexSettings}
+import net.sc8s.logstage.elastic.Logging.IzLoggerTags
 
 import java.time.LocalDateTime
 import scala.concurrent.Future
@@ -35,6 +35,9 @@ object Evolver extends ClusterComponent.Singleton {
     private[Evolver] case class MigrateNextIndex(pendingIndices: Seq[Index]) extends Command
     private[Evolver] case class MigrateIndex(index: Index, oldIndexName: String, newIndexName: String, pendingIndices: Seq[Index]) extends Command
 
+    private[Evolver] case class UpdateIndexSettings(index: Index, pendingIndices: Seq[Index]) extends Command
+    private[Evolver] case class IndexSettingsUpdated(result: Try[Done]) extends Command
+
     private[Evolver] case class AddMappings(index: Index, mappings: Seq[ElasticField], pendingIndices: Seq[Index]) extends Command
     private[Evolver] case class MappingsAdded(result: Try[Done]) extends Command
 
@@ -140,6 +143,7 @@ object Evolver extends ClusterComponent.Singleton {
               MappingDefinition(meta = Map(
                 mappingsHashField -> index.mappingsHash,
                 analysisHashField -> index.analysisHash,
+                settingsHashField -> index.settingsHash,
               ), properties = index.mappings :+ KeywordField(Index.discriminator))
             )
             .analysis(index.analysis)
@@ -173,17 +177,20 @@ object Evolver extends ClusterComponent.Singleton {
                     val maybeHashes = for {
                       analysisHash <- existingIndex.mappings.meta.get(analysisHashField)
                       mappingsHash <- existingIndex.mappings.meta.get(mappingsHashField)
-                    } yield analysisHash -> mappingsHash
+                      settingsHash <- existingIndex.mappings.meta.get(settingsHashField)
+                    } yield (analysisHash, mappingsHash, settingsHash)
 
                     maybeHashes match {
                       case _ if forceReindex =>
                         log.warn(s"${"forcingReindex" -> "tag"} of ${index.name -> "index"}")
                         migrateIndex
 
-                      case Some((existingAnalysisHash, existingMappingsHash)) =>
+                      case Some((existingAnalysisHash, existingMappingsHash, existingSettingsHash)) =>
                         // it's possible but hard to check whether mappings have only been added (in which case a reindex would not be necessary), or existing have changed. we just take the easy route...
                         if (existingAnalysisHash != index.analysisHash || existingMappingsHash != index.mappingsHash)
                           migrateIndex
+                        else if (existingSettingsHash != index.settingsHash)
+                          Future.successful(UpdateIndexSettings(index, updatedPendingIndices))
                         else {
                           log.info(s"${"skippingMigration" -> "tag"} of ${index.name -> "index"}")
                           Future.successful(MigrateNextIndex(updatedPendingIndices))
@@ -195,7 +202,7 @@ object Evolver extends ClusterComponent.Singleton {
                     }
                 }
 
-                context.pipeToSelf(eventualCommand)(_.fold(e => IndexMigrationFailed(index, e), identity))
+                context.pipeToSelf(eventualCommand)(_.fold(IndexMigrationFailed(index, _), identity))
                 Behaviors.same
             }
 
@@ -207,6 +214,13 @@ object Evolver extends ClusterComponent.Singleton {
             )(triedDone => MappingsAdded(triedDone))
             addingMappings(index, pendingIndices)
 
+          case UpdateIndexSettings(index, pendingIndices) =>
+            log.infoT("updatingSettings", s"${index.name -> "index"} ${index.settings}")
+            context.pipeToSelf(
+              elasticClient.execute(updateSettings(index.name, index.settings.view.mapValues(_.toString).toMap)).map(_.result).map(_ => Done)
+            )(triedDone => IndexSettingsUpdated(triedDone))
+            updatingIndexSettings(index, pendingIndices)
+
           case MigrateIndex(index, oldIndexName, newIndexName, pendingIndices) =>
             log.info(s"${"migratingIndex" -> "tag"} ${index.name -> "index"} from $oldIndexName to $newIndexName")
             val eventualCommand = for {
@@ -242,6 +256,17 @@ object Evolver extends ClusterComponent.Singleton {
             idle
         }
 
+        def updatingIndexSettings(index: Index, pendingIndices: Seq[Index]) = Behaviors.receiveMessagePartial[Command] {
+          case IndexSettingsUpdated(Success(_)) =>
+            log.infoT("indexSettingsUpdated", s"${index.name -> "index"}")
+            context.self ! MigrateNextIndex(pendingIndices)
+            migratingIndices(forceReindex)
+
+          case IndexSettingsUpdated(Failure(exception)) =>
+            log.errorT("updatingIndexSettingsFailed", s"${index.name -> "index"} with $exception, aborting")
+            idle
+        }
+
         def migratingIndex(index: Index, oldIndexName: String, newIndexName: String, pendingIndices: Seq[Index]) = Behaviors.withTimers[Command](timerScheduler => Behaviors.receiveMessagePartial {
           case IndexMigrationStarted(nodeId, taskId) =>
             log.info(s"${"indexMigrationQueued" -> "tag"} of ${index.name -> "index"} at $nodeId with $taskId")
@@ -377,6 +402,8 @@ object Evolver extends ClusterComponent.Singleton {
 
   private val analysisHashField = "analysisHash"
 
+  private val settingsHashField = "settingsHash"
+
   override val name = "elastic-evolver"
 
   override val commandSerializer = CirceSerializer()
diff --git a/elastic/core/src/main/scala/Index.scala b/elastic/core/src/main/scala/Index.scala
index 426167e..0dd21c7 100644
--- a/elastic/core/src/main/scala/Index.scala
+++ b/elastic/core/src/main/scala/Index.scala
@@ -55,6 +55,8 @@ abstract class Index(
 
   final lazy val analysisHash = analysis.toString.hashCode.toString
 
+  final lazy val settingsHash = settings.toString.hashCode.toString
+
   def hitIdFromId(id: Id): Json
 
   lazy implicit val latestTraitIndexable: Indexable[Latest] = indexableWithCirce(implicitly)