Upgrade to 7.5

I have only one node:

curl http://localhost:9200/_cluster/health?pretty
{
"cluster_name" : "elasticsearch",
"status" : "yellow",
"timed_out" : false,
"number_of_nodes" : 1,
"number_of_data_nodes" : 1,
"active_primary_shards" : 506,
"active_shards" : 506,
"relocating_shards" : 0,
"initializing_shards" : 0,
"unassigned_shards" : 483,
"delayed_unassigned_shards" : 0,
"number_of_pending_tasks" : 0,
"number_of_in_flight_fetch" : 0,
"task_max_waiting_in_queue_millis" : 0,
"active_shards_percent_as_number" : 51.162790697674424
}

and version 7.5

curl -XGET 'localhost:9200'
{
"name" : "logstash",
"cluster_name" : "elasticsearch",
"cluster_uuid" : "ZHKFoiR-TmSHxw8Wg9AHAg",
"version" : {
"number" : "7.5.0",
"build_flavor" : "default",
"build_type" : "deb",
"build_hash" : "e9ccaed468e2fac2275a3761849cbee64b39519f",
"build_date" : "2019-11-26T01:06:52.518245Z",
"build_snapshot" : false,
"lucene_version" : "8.3.0",
"minimum_wire_compatibility_version" : "6.8.0",
"minimum_index_compatibility_version" : "6.0.0-beta1"
},
"tagline" : "You Know, for Search"
}

after upgrade from 7.4 to 7.5 I have error in Kibana log:

logstash kibana[5427]: {"type":"log","@timestamp":"2019-12-06T05:08:35Z","tags":["info","migrations"],"pid":5427,"message":"Detected mapping change in "properties.task""}

Please, Help me!
Thank you in advance