define couchDB connection pool size

FAB-17277 fix too many TCP connections between peer and CouchDB

Increase the connection pool size per host from 2 to 2000.
Also, increase the total connection pool size to 2000.

Signed-off-by: Senthil Nathan N <cendhu@gmail.com>

core/ledger/util/couchdb/couchdbutil.go

@@ -61,8 +61,14 @@ func CreateCouchInstance(config *Config, metricsProvider metrics.Provider) (*Cou
 			KeepAlive: 30 * time.Second,
 			DualStack: true,
 		}).DialContext,
+		ForceAttemptHTTP2:     true,
+		MaxIdleConns:          2000,
+		MaxIdleConnsPerHost:   2000,
+		IdleConnTimeout:       90 * time.Second,
+		TLSHandshakeTimeout:   10 * time.Second,
+		ExpectContinueTimeout: 1 * time.Second,
 	}
-	transport.DisableCompression = false
+
 	client.Transport = transport
 
 	//Create the CouchDB instance