High disk usage watermark on ES prevents docs to be indexed but feedback from datashare is OK

[bamthomas]

Describe the bug

Elasticsearch is checking the disk usage before indexing. High disk usage watermark on ES prevents docs to be indexed but feedback from datashare is OK

To Reproduce

1. either feed your disk with data or change the wartermark level in ES
2. index some documents
3. there should be errors in the console
4. the indexation should be ok but documents not indexed in datashare

Expected behavior

Datashare should transparently fail.