An incomplete shard snapshot will prevent a shard from moving away from a node (see `SnapshotInProgressAllocationDecider`). That means that when a shard snapshot completes it may become possible to perform some shard movements that previously were not possible, so we should trigger a reroute to start those movements. AFAICT we do not trigger such a reroute today.
test/framework/src/main/java/org/elasticsearch/test/ESTestCase.java
int start = name.indexOf('{');
        if (start < 0) return "";
        int end = name.lastIndexOf('}');
        if (end < 0) return "";
        return "[" + name.substring(start + 1, end) + "] ";
    }
    public void ensureNoWarnings() {
        
        
        try {
            final List<String> warnings = threadContext.getResponseHeaders().get("Warning");
            if (warnings != null) {
                
                final List<String> filteredWarnings = warnings.stream()
                    .filter(k -> filteredWarnings().stream().noneMatch(s -> k.contains(s)))
                    .collect(Collectors.toList());
                assertThat("unexpected warning headers", filteredWarnings, empty());
            } else {
                assertNull("unexpected warning headers", warnings);
            }
        } finally {
            resetDeprecationLogger();
        }
    }
    protected List<String> filteredWarnings() {
        List<String> filtered = new ArrayList<>();
        filtered.add(
            "Configuring multiple [path.data] paths is deprecated. Use RAID or other system level features for utilizing"
                + " multiple disks. This feature will be removed in a future release."
        );