Rename Tag(s) to Event(s) (#4046)

* Rename Tag(s) to Event(s)

- tag was replaced with event, but in some places it still mentions tag, would be easier to understand if we tried to replace it with event to not confuse people.

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* more  changes from tag -> event

* rename events to compositeKeys and keys

* Apply suggestions from code review

Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>

* add minor documentation on how composite keys are constructed

* rename eventkey to compositekey

Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>

* add changelog entry & add info to regenerate confid to changelog entry

rpc/client/rpc_test.go

@@ -452,14 +452,14 @@ func TestTxSearch(t *testing.T) {
 		require.Nil(t, err, "%+v", err)
 		require.Len(t, result.Txs, 0)
 
-		// query using a tag (see kvstore application)
+		// query using a compositeKey (see kvstore application)
 		result, err = c.TxSearch("app.creator='Cosmoshi Netowoko'", false, 1, 30)
 		require.Nil(t, err, "%+v", err)
 		if len(result.Txs) == 0 {
 			t.Fatal("expected a lot of transactions")
 		}
 
-		// query using a tag (see kvstore application) and height
+		// query using a compositeKey (see kvstore application) and height
 		result, err = c.TxSearch("app.creator='Cosmoshi Netowoko' AND tx.height<10000", true, 1, 30)
 		require.Nil(t, err, "%+v", err)
 		if len(result.Txs) == 0 {

rpc/test/helpers.go

@@ -97,7 +97,7 @@ func createConfig() *cfg.Config {
 	c.RPC.ListenAddress = rpc
 	c.RPC.CORSAllowedOrigins = []string{"https://tendermint.com/"}
 	c.RPC.GRPCListenAddress = grpc
-	c.TxIndex.IndexTags = "app.creator,tx.height" // see kvstore application
+	c.TxIndex.IndexKeys = "app.creator,tx.height" // see kvstore application
 	return c
 }