diff --git a/kmongo-core/src/main/kotlin/org/litote/kmongo/MongoCollections.kt b/kmongo-core/src/main/kotlin/org/litote/kmongo/MongoCollections.kt
index c2e2f61d..70f72845 100644
--- a/kmongo-core/src/main/kotlin/org/litote/kmongo/MongoCollections.kt
+++ b/kmongo-core/src/main/kotlin/org/litote/kmongo/MongoCollections.kt
@@ -697,7 +697,11 @@ fun <T> MongoCollection<T>.ensureIndex(keys: String, indexOptions: IndexOptions
     } catch (e: MongoCommandException) {
         //there is an exception if the parameters of an existing index are changed.
         //then drop the index and create a new one
-        dropIndexOfKeys(keys)
+        try {
+            dropIndexOfKeys(keys)
+        } catch (e2: Exception) {
+            //ignore
+        }
         createIndex(keys, indexOptions)
     }
 }
diff --git a/kmongo-core/src/main/kotlin/org/litote/kmongo/MongoCollectionsWithClientSession.kt b/kmongo-core/src/main/kotlin/org/litote/kmongo/MongoCollectionsWithClientSession.kt
index 2095e73c..8f4a8be2 100644
--- a/kmongo-core/src/main/kotlin/org/litote/kmongo/MongoCollectionsWithClientSession.kt
+++ b/kmongo-core/src/main/kotlin/org/litote/kmongo/MongoCollectionsWithClientSession.kt
@@ -753,7 +753,11 @@ fun <T> MongoCollection<T>.ensureIndex(
     } catch (e: MongoCommandException) {
         //there is an exception if the parameters of an existing index are changed.
         //then drop the index and create a new one
-        dropIndex(clientSession, keys)
+        try {
+            dropIndex(clientSession, keys)
+        } catch (e2: Exception) {
+            //ignore
+        }
         createIndex(clientSession, keys, indexOptions)
     }
 }
diff --git a/kmongo-coroutine-core/src/main/kotlin/org/litote/kmongo/coroutine/MongoCollections.kt b/kmongo-coroutine-core/src/main/kotlin/org/litote/kmongo/coroutine/MongoCollections.kt
index 73be7fbd..b76e3419 100644
--- a/kmongo-coroutine-core/src/main/kotlin/org/litote/kmongo/coroutine/MongoCollections.kt
+++ b/kmongo-coroutine-core/src/main/kotlin/org/litote/kmongo/coroutine/MongoCollections.kt
@@ -1258,7 +1258,13 @@ suspend fun <T> MongoCollection<T>.ensureIndex(
     } catch (e: MongoCommandException) {
         //there is an exception if the parameters of an existing index are changed.
         //then drop the index and create a new one
-        singleResult<Void> { dropIndex(keys, it) }
+        singleResult<Void> {
+            try {
+                dropIndex(keys, it)
+            } catch (e2: Exception) {
+                //ignore
+            }
+        }
         singleResult { createIndex(keys, indexOptions, it) }
     }
 
diff --git a/kmongo-rxjava2-core/src/main/kotlin/org/litote/kmongo/rxjava2/MongoCollections.kt b/kmongo-rxjava2-core/src/main/kotlin/org/litote/kmongo/rxjava2/MongoCollections.kt
index a5913978..e5619ccb 100644
--- a/kmongo-rxjava2-core/src/main/kotlin/org/litote/kmongo/rxjava2/MongoCollections.kt
+++ b/kmongo-rxjava2-core/src/main/kotlin/org/litote/kmongo/rxjava2/MongoCollections.kt
@@ -740,6 +740,7 @@ fun <T> MongoCollection<T>.ensureIndex(keys: String, indexOptions: IndexOptions
     return createIndex(keys, indexOptions)
         .onErrorResumeNext(
             dropIndex(keys)
+                .onErrorComplete()
                 .andThen(createIndex(keys, indexOptions))
         )
         .flatMapCompletable { _ ->
@@ -763,6 +764,7 @@ fun <T> MongoCollection<T>.ensureIndex(
     return maybeResult<String> { createIndex(keys, indexOptions, it) }
         .onErrorResumeNext(
             completableResult { dropIndex(keys, it) }
+                .onErrorComplete()
                 .andThen(maybeResult { createIndex(keys, indexOptions, it) })
         )
         .flatMapCompletable { _ ->
diff --git a/kmongo-rxjava2-core/src/main/kotlin/org/litote/kmongo/rxjava2/ReactiveStreamsMongoCollections.kt b/kmongo-rxjava2-core/src/main/kotlin/org/litote/kmongo/rxjava2/ReactiveStreamsMongoCollections.kt
index af79ae4b..9bd5c21f 100644
--- a/kmongo-rxjava2-core/src/main/kotlin/org/litote/kmongo/rxjava2/ReactiveStreamsMongoCollections.kt
+++ b/kmongo-rxjava2-core/src/main/kotlin/org/litote/kmongo/rxjava2/ReactiveStreamsMongoCollections.kt
@@ -547,6 +547,7 @@ fun <T> MongoCollection<T>.ensureIndex(keys: String, indexOptions: IndexOptions
         .onErrorResumeNext(
             dropIndex(keys)
                 .completable()
+                .onErrorComplete()
                 .andThen(createIndex(keys, indexOptions))
         )
         .flatMapCompletable { _ ->
@@ -569,7 +570,9 @@ fun <T> MongoCollection<T>.ensureIndex(
 ): Completable {
     return createIndex(keys, indexOptions).maybe()
         .onErrorResumeNext(
-            dropIndex(keys).completable()
+            dropIndex(keys)
+                .completable()
+                .onErrorComplete()
                 .andThen(createIndex(keys, indexOptions).maybe())
         )
         .flatMapCompletable { _ ->