adapt _cat/nodes to node.client removal

_cat/nodes used to return `c` for client node or `d` for data node as part of the node.role column. This commit changes it to return `m` for master eligible, `d` for data and/or `i` for ingest. A node with no explicit roles will be a coordinating only node and marked with `-`. A node can obviously have multiple roles. The master column has been adapted to return only whether a node is the current master (`*`) or not (`-`).

core/src/main/java/org/elasticsearch/rest/action/cat/RestNodesAction.java

@@ -44,11 +44,11 @@ import org.elasticsearch.index.engine.SegmentsStats;
 import org.elasticsearch.index.fielddata.FieldDataStats;
 import org.elasticsearch.index.flush.FlushStats;
 import org.elasticsearch.index.get.GetStats;
-import org.elasticsearch.index.shard.IndexingStats;
 import org.elasticsearch.index.merge.MergeStats;
 import org.elasticsearch.index.percolator.PercolateStats;
 import org.elasticsearch.index.refresh.RefreshStats;
 import org.elasticsearch.index.search.stats.SearchStats;
+import org.elasticsearch.index.shard.IndexingStats;
 import org.elasticsearch.index.suggest.stats.SuggestStats;
 import org.elasticsearch.indices.NodeIndicesStats;
 import org.elasticsearch.monitor.fs.FsInfo;
@@ -67,7 +67,7 @@ import org.elasticsearch.script.ScriptStats;
 import org.elasticsearch.search.suggest.completion.CompletionStats;
 
 import java.util.Locale;
-import java.util.Map;
+import java.util.stream.Collectors;
 
 import static org.elasticsearch.rest.RestRequest.Method.GET;
 
@@ -142,8 +142,8 @@ public class RestNodesAction extends AbstractCatAction {
         table.addCell("load_5m", "alias:l;text-align:right;desc:5m load avg");
         table.addCell("load_15m", "alias:l;text-align:right;desc:15m load avg");
         table.addCell("uptime", "default:false;alias:u;text-align:right;desc:node uptime");
-        table.addCell("node.role", "alias:r,role,dc,nodeRole;desc:d:data node, c:client node");
-        table.addCell("master", "alias:m;desc:m:master-eligible, *:current master");
+        table.addCell("node.role", "alias:r,role,nodeRole;desc:m:master eligible node, d:data node, i:ingest node, -:coordinating node only");
+        table.addCell("master", "alias:m;desc:*:current master");
         table.addCell("name", "alias:n;desc:node name");
 
         table.addCell("completion.size", "alias:cs,completionSize;default:false;text-align:right;desc:size of completion");
@@ -284,8 +284,15 @@ public class RestNodesAction extends AbstractCatAction {
             table.addCell(!hasLoadAverage || osStats.getCpu().getLoadAverage()[1] == -1 ? null : String.format(Locale.ROOT, "%.2f", osStats.getCpu().getLoadAverage()[1]));
             table.addCell(!hasLoadAverage || osStats.getCpu().getLoadAverage()[2] == -1 ? null : String.format(Locale.ROOT, "%.2f", osStats.getCpu().getLoadAverage()[2]));
             table.addCell(jvmStats == null ? null : jvmStats.getUptime());
-            table.addCell(node.clientNode() ? "c" : node.dataNode() ? "d" : "-");
-            table.addCell(masterId == null ? "x" : masterId.equals(node.id()) ? "*" : node.masterNode() ? "m" : "-");
+
+            String roles;
+            if (node.getRoles().size() == 0) {
+                roles = "-";
+            } else {
+                roles = node.getRoles().stream().map(DiscoveryNode.Role::getAbbreviation).collect(Collectors.joining());
+            }
+            table.addCell(roles);
+            table.addCell(masterId == null ? "x" : masterId.equals(node.id()) ? "*" : "-");
             table.addCell(node.name());
 
             CompletionStats completionStats = indicesStats == null ? null : stats.getIndices().getCompletion();

docs/reference/cat/nodes.asciidoc

@@ -41,10 +41,10 @@ it?
 
 [source,sh]
 --------------------------------------------------
-uptime data/client master name
-  3.5h d           m      Boneyard
-  3.5h d           *      Athena
-  3.5h d           m      Zarek
+uptime node.role master name
+  3.5h di        -      Boneyard
+  3.5h md        *      Athena
+  3.5h i         -      Zarek
 --------------------------------------------------
 
 [float]
@@ -105,9 +105,9 @@ descriptors |1024
 |`load` |`l` |No |Most recent load average |0.22
 |`cpu` | |No |Recent system CPU usage as percent |12
 |`uptime` |`u` |No |Node uptime |17.3m
-|`node.role` |`r`, `role`, `dc`, `nodeRole` |Yes |Data node (d); Client
-node (c) |d
-|`master` |`m` |Yes |Current master (*); master eligible (m) |m
+|`node.role` |`r`, `role`, `dc`, `nodeRole` |Yes |Master eligible node (m);
+Data node (d); Ingest node (i); Coordinating node only (-) |mdi
+|`master` |`m` |Yes |Current master (*); |*
 |`name` |`n` |Yes |Node name |Venom
 |`completion.size` |`cs`, `completionSize` |No |Size of completion |0b
 |`fielddata.memory_size` |`fm`, `fielddataMemory` |No |Used fielddata

rest-api-spec/src/main/resources/rest-api-spec/test/cat.nodes/10_basic.yaml

@@ -6,8 +6,8 @@
 
   - match:
       $body: |
-               /  #ip                          heap.percent        ram.percent     cpu         load_1m                load_5m                load_15m               node.role        master          name
-               ^  ((\d{1,3}\.){3}\d{1,3}  \s+  \d+            \s+  \d*         \s+ (-)?\d* \s+ ((-)?\d*(\.\d+)?)? \s+ ((-)?\d*(\.\d+)?)? \s+ ((-)?\d*(\.\d+)?)? \s+ [-dc]       \s+  [-*mx]    \s+   (\S+\s?)+     \n)+  $/
+               /  #ip                          heap.percent        ram.percent     cpu         load_1m                load_5m                load_15m               node.role          master          name
+               ^  ((\d{1,3}\.){3}\d{1,3}  \s+  \d+            \s+  \d*         \s+ (-)?\d* \s+ ((-)?\d*(\.\d+)?)? \s+ ((-)?\d*(\.\d+)?)?\s+  ((-)?\d*(\.\d+)?)? \s+ (-|[dmi]{1,3}) \s+ [-*x]     \s+   (\S+\s?)+     \n)+  $/
 
   - do:
       cat.nodes:
@@ -15,8 +15,8 @@
 
   - match:
       $body: |
-               /^  ip                     \s+  heap\.percent   \s+  ram\.percent \s+ cpu      \s+ load_1m            \s+ load_5m            \s+ load_15m           \s+ node\.role   \s+  master   \s+   name  \n
-                  ((\d{1,3}\.){3}\d{1,3}  \s+  \d+             \s+  \d*          \s+ (-)?\d* \s+  ((-)?\d*(\.\d+)?)? \s+ ((-)?\d*(\.\d+)?)? \s+ ((-)?\d*(\.\d+)?)? \s+ [-dc]        \s+  [-*mx]    \s+   (\S+\s?)+     \n)+  $/
+               /^  ip                     \s+  heap\.percent   \s+  ram\.percent \s+ cpu      \s+ load_1m            \s+ load_5m            \s+ load_15m           \s+ node\.role     \s+  master   \s+   name  \n
+                  ((\d{1,3}\.){3}\d{1,3}  \s+  \d+             \s+  \d*          \s+ (-)?\d* \s+  ((-)?\d*(\.\d+)?)? \s+ ((-)?\d*(\.\d+)?)? \s+ ((-)?\d*(\.\d+)?)? \s+ (-|[dmi]{1,3}) \s+  [-*x]    \s+   (\S+\s?)+     \n)+  $/
 
   - do:
       cat.nodes: