add collection for buckets

other/java/client/src/main/proto/filer.proto

@@ -125,6 +125,7 @@ message Entry {
 
     RemoteEntry remote_entry = 10;
     int64 quota = 11; // for bucket only. Positive/Negative means enabled/disabled.
+    string collection = 12; // for bucket only. Empty means using default bucket name.
 }
 
 message FullEntry {

weed/pb/filer.proto

@@ -125,6 +125,7 @@ message Entry {
 
     RemoteEntry remote_entry = 10;
     int64 quota = 11; // for bucket only. Positive/Negative means enabled/disabled.
+    string collection = 12; // for bucket only. Empty means using default bucket name.
 }
 
 message FullEntry {

weed/pb/filer_pb/filer.pb.go

@@ -342,6 +342,7 @@ type Entry struct {
 	Content         []byte            `protobuf:"bytes,9,opt,name=content,proto3" json:"content,omitempty"`                                           // if not empty, the file content
 	RemoteEntry     *RemoteEntry      `protobuf:"bytes,10,opt,name=remote_entry,json=remoteEntry,proto3" json:"remote_entry,omitempty"`
 	Quota           int64             `protobuf:"varint,11,opt,name=quota,proto3" json:"quota,omitempty"`          // for bucket only. Positive/Negative means enabled/disabled.
+	Collection      string            `protobuf:"bytes,12,opt,name=collection,proto3" json:"collection,omitempty"` // for bucket only. Empty means using default bucket name.
 }
 
 func (x *Entry) Reset() {
@@ -446,6 +447,13 @@ func (x *Entry) GetQuota() int64 {
 	return 0
 }
 
+func (x *Entry) GetCollection() string {
+	if x != nil {
+		return x.Collection
+	}
+	return ""
+}
+
 type FullEntry struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -4498,7 +4506,7 @@ var file_filer_proto_rawDesc = []byte{
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@@ -4524,7 +4532,9 @@ var file_filer_proto_rawDesc = []byte{
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