The shard cannot be allocated to the same node on which a copy of the shard already exist

Dear,

I have a strange probleme with elasticsearch (v6.8.8) on ubuntu-server
I have several indexes on one unique node.

_cat/indices?v :

health status index                     uuid                   pri rep docs.count docs.deleted store.size     pri.store.size
green  open   gl-system-events_0        rmkGOB-9TL6Fh-TGTnGxcA   4   0          0            0        1kb            1kb
yellow open   elastalert_status_status  RZLm4vyQTuukhhpAPZ1Y6A   5   1          0            0      1.2kb          1.2kb
yellow open   elastalert_status_silence IHZgj28FTV-O8J31pZcb5Q   5   1          0            0      1.2kb          1.2kb
yellow open   elastalert_status         02oyKzFpQ2KBxg9epcDiGA   5   1          0            0      1.2kb          1.2kb
yellow open   elastalert_status_error   vXlmQ5oCTr6OIi68kqHPsw   5   1          0            0      1.2kb          1.2kb
green  open   gl-events_0               lTkAMPFGTvqKwEnEUzqPXQ   4   0          0            0        1kb            1kb
yellow open   elastalert_status_past    aKBCLAs3Sze6CzToFNuftA   5   1          0            0      1.2kb          1.2kb
green  open   custom-indice_0                 1vQdWQHsQAmAShVxIRdD8g   4   0        149            0      1.7mb          1.7mb

_cluster/allocation/explain?pretty :

index "elastalert_status"
shard 1
primary false
current_state "unassigned"
unassigned_info
reason "INDEX_CREATED"
at "2020-04-10T13:14:49.767Z"
last_allocation_status "no_attempt"
can_allocate "no"
allocate_explanation "cannot allocate because allocation is not permitted to any of the nodes"
node_allocation_decisions
0
node_id "FX5I0KjPRk2m4CwbqIB68g"
node_name "FX5I0Kj"
transport_address "X.X.X.X:9300"
node_decision "no"
weight_ranking 1
deciders
0
decider "same_shard"
decision "NO"
explanation "the shard cannot be allocated to the same node on which a copy of the shard already exists [[elastalert_status][1], node[FX5I0KjPRk2m4CwbqIB68g], [P], s[STARTED], a[id=pnuCvhWJSYWvjQXbnOzzhg]]"

I have tried to reset all data by curl -XDELETE X.X.X.X:9200/_all and recreate index, but i still have the same problem.

Thanks for your help.

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