Help.Full text Search index new documents , but don't works with initial index

Any idea ? thks

CentOS 7 (64-bit)
Nextcloud version: 16.0.5

Full text search:1.3.6
Full text search - Elasticsearch Platform:1.3.6
Full text search - Files 1.3.6

curl -XGET 'http://localhost:9200'

"cluster_name" : "elasticsearch",
"cluster_uuid" : "6L5YrU3nTxKV7IdhkF8Ozg",
"version" : {
"number" : "7.4.2",
"build_flavor" : "default",
"build_type" : "rpm",
"build_hash" : "2f90bbf7b93631e52bafb59b3b049cb44ec25e96",
"build_date" : "2019-10-28T20:40:44.881551Z",
"build_snapshot" : false,
"lucene_version" : "8.2.0",
"minimum_wire_compatibility_version" : "6.8.0",
"minimum_index_compatibility_version" : "6.0.0-beta1"
},
"tagline" : "You Know, for Search"
}

sudo -u apache php /var/www/html/nextcloud/occ fulltextsearch:index

Options: []
Memory: 21 MB
┌─ Indexing ────
│ Action: generateIndexFiles
│ Provider: Files Account: XXXXXX
│ Document: 389713
│ Info:
│ Title:
│ Content size: 3075680
│ Chunk: 0/0
│ Progress: all/0
└──
┌─ Results ────
│ Result: 32/32
│ Index: files:389713
│ Status: ok
│ Message: {"_index":"nextcloud_index","_type":"standard","_id":"files:389713","_version":1,"result":"created","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":31,"_primary_term":1}
│
│
└──
┌─ Errors ────
│ Error: 0/0
│ Index:
│ Exception:
│ Message:
│
│
└──

Start by reproducing the issue with occ fulltextsearch:index and checking the Elasticsearch response from http://localhost:9200. Compare the reported successful initial indexing with whether the resulting documents can actually be found; done means the initial index contains searchable documents without errors.