Improve documentation for server metricset in Zookeeper metricbeat mo…

…dule (elastic#10692)

metricbeat/docs/fields.asciidoc

@@ -26201,7 +26201,7 @@ server contains the metrics reported by the four-letter `srvr` command.
 --
 type: long
 
-Connections established by the server
+Number of clients currently connected to the server
 
 --
 
@@ -26211,7 +26211,7 @@ Connections established by the server
 --
 type: long
 
-Average latency of the server
+Average amount of time taken for the server to respond to a client request
 
 --
 
@@ -26220,7 +26220,7 @@ Average latency of the server
 --
 type: long
 
-Max latency reached by the server
+Maximum amount of time taken for the server to respond to a client request
 
 --
 
@@ -26229,7 +26229,7 @@ Max latency reached by the server
 --
 type: long
 
-Minimum latency that has been reached by the server
+Minimum amount of time taken for the server to respond to a client request
 
 --
 
@@ -26238,7 +26238,7 @@ Minimum latency that has been reached by the server
 --
 type: keyword
 
-Server mode
+Mode of the server. In an ensemble, this may either be leader or follower. Otherwise, it is standalone
 
 --
 
@@ -26256,7 +26256,7 @@ Total number of nodes
 --
 type: long
 
-Outstanding
+Number of requests queued at the server. This exceeds zero when the server receives more requests than it is able to process
 
 --
 
@@ -26265,7 +26265,7 @@ Outstanding
 --
 type: long
 
-Received requests to the server
+Number of requests received by the server
 
 --
 
@@ -26274,7 +26274,7 @@ Received requests to the server
 --
 type: long
 
-Requests sent by the server
+Number of requests sent by the server
 
 --
 
@@ -26283,7 +26283,7 @@ Requests sent by the server
 --
 type: date
 
-Date of the Zookeeper release in use
+Date of the Zookeeper release currently in use
 
 --
 
@@ -26292,7 +26292,7 @@ Date of the Zookeeper release in use
 --
 type: keyword
 
-Original value of the Zookeeper transaction ID
+Unique value of the Zookeeper transaction ID. The zxid consists of an epoch and a counter. It is established by the leader and is used to determine the temporal ordering of changes
 
 --
 
@@ -26310,7 +26310,7 @@ Total transactions of the leader in epoch
 --
 type: long
 
-Epoch value of the Zookeeper transaction ID
+Epoch value of the Zookeeper transaction ID. An epoch signifies the period in which a server is a leader
 
 --
 

metricbeat/module/zookeeper/server/_meta/fields.yml

@@ -5,43 +5,43 @@
   fields:
     - name: connections
       type: long
-      description: Connections established by the server
+      description: Number of clients currently connected to the server
     - name: latency
       type: group
       fields:
         - name: avg
           type: long
-          description: Average latency of the server
+          description: Average amount of time taken for the server to respond to a client request
         - name: max
           type: long
-          description: Max latency reached by the server
+          description: Maximum amount of time taken for the server to respond to a client request
         - name: min
           type: long
-          description: Minimum latency that has been reached by the server
+          description: Minimum amount of time taken for the server to respond to a client request
     - name: mode
       type: keyword
-      description: Server mode
+      description: Mode of the server. In an ensemble, this may either be leader or follower. Otherwise, it is standalone
     - name: node_count
       type: long
       description: Total number of nodes
     - name: outstanding
       type: long
-      description: Outstanding
+      description: Number of requests queued at the server. This exceeds zero when the server receives more requests than it is able to process
     - name: received
       type: long
-      description: Received requests to the server
+      description: Number of requests received by the server
     - name: sent
       type: long
-      description: Requests sent by the server
+      description: Number of requests sent by the server
     - name: version_date
       type: date
-      description: Date of the Zookeeper release in use
+      description: Date of the Zookeeper release currently in use
     - name: zxid
       type: keyword
-      description: Original value of the Zookeeper transaction ID
+      description: Unique value of the Zookeeper transaction ID. The zxid consists of an epoch and a counter. It is established by the leader and is used to determine the temporal ordering of changes
     - name: count
       type: long
       description: Total transactions of the leader in epoch
     - name: epoch
       type: long
-      description: Epoch value of the Zookeeper transaction ID
+      description: Epoch value of the Zookeeper transaction ID. An epoch signifies the period in which a server is a leader