Fix reindex test after toString change

Weakens the assertion on wait_for_active_shards so that we don't
check the toString of the bulk request because it isn't important.

Relates to #22900

modules/reindex/src/test/resources/rest-api-spec/test/delete_by_query/50_wait_for_active_shards.yaml

@@ -26,7 +26,7 @@
             match_all: {}
 
   - match:
-      failures.0.cause.reason: /Not.enough.active.copies.to.meet.shard.count.of.\[4\].\(have.1,.needed.4\)..Timeout\:.\[1s\],.request:.\[BulkShardRequest.to.\[test\].containing.\[1\].requests\]/
+      failures.0.cause.reason: /Not.enough.active.copies.to.meet.shard.count.of.\[4\].\(have.1,.needed.4\)..Timeout\:.\[1s\],.request:.+/
 
   - do:
       indices.refresh: {}

modules/reindex/src/test/resources/rest-api-spec/test/reindex/60_wait_for_active_shards.yaml

@@ -26,7 +26,7 @@
           dest:
             index: dest
   - match:
-      failures.0.cause.reason: /Not.enough.active.copies.to.meet.shard.count.of.\[4\].\(have.1,.needed.4\)\..Timeout\:.\[1s\],.request:.\[BulkShardRequest.to.\[dest\].containing.\[1\].requests\]/
+      failures.0.cause.reason: /Not.enough.active.copies.to.meet.shard.count.of.\[4\].\(have.1,.needed.4\)\..Timeout\:.\[1s\],.request:.+/
 
   - do:
       reindex:

modules/reindex/src/test/resources/rest-api-spec/test/update_by_query/50_consistency.yaml

@@ -22,7 +22,7 @@
         wait_for_active_shards: 4
         timeout: 1s
   - match:
-      failures.0.cause.reason: /Not.enough.active.copies.to.meet.shard.count.of.\[4\].\(have.1,.needed.4\)..Timeout\:.\[1s\],.request:.\[BulkShardRequest.to.\[test\].containing.\[1\].requests\]/
+      failures.0.cause.reason: /Not.enough.active.copies.to.meet.shard.count.of.\[4\].\(have.1,.needed.4\)..Timeout\:.\[1s\],.request:.+/
 
   - do:
       update_by_query: