@Override
 public IndexMetaData readFrom(StreamInput in) throws IOException {
   Builder builder = new Builder(in.readString());
   builder.version(in.readLong());
   builder.state(State.fromId(in.readByte()));
   builder.settings(readSettingsFromStream(in));
   int mappingsSize = in.readVInt();
   for (int i = 0; i < mappingsSize; i++) {
     MappingMetaData mappingMd = MappingMetaData.PROTO.readFrom(in);
     builder.putMapping(mappingMd);
   }
   int aliasesSize = in.readVInt();
   for (int i = 0; i < aliasesSize; i++) {
     AliasMetaData aliasMd = AliasMetaData.Builder.readFrom(in);
     builder.putAlias(aliasMd);
   }
   int customSize = in.readVInt();
   for (int i = 0; i < customSize; i++) {
     String type = in.readString();
     Custom customIndexMetaData = lookupPrototypeSafe(type).readFrom(in);
     builder.putCustom(type, customIndexMetaData);
   }
   int activeAllocationIdsSize = in.readVInt();
   for (int i = 0; i < activeAllocationIdsSize; i++) {
     int key = in.readVInt();
     Set<String> allocationIds =
         DiffableUtils.StringSetValueSerializer.getInstance().read(in, key);
     builder.putActiveAllocationIds(key, allocationIds);
   }
   return builder.build();
 }
 public static IndexMetaData readFrom(StreamInput in) throws IOException {
   Builder builder = new Builder(in.readUTF());
   builder.version(in.readLong());
   builder.state(State.fromId(in.readByte()));
   builder.settings(readSettingsFromStream(in));
   int mappingsSize = in.readVInt();
   for (int i = 0; i < mappingsSize; i++) {
     MappingMetaData mappingMd = MappingMetaData.readFrom(in);
     builder.putMapping(mappingMd);
   }
   int aliasesSize = in.readVInt();
   for (int i = 0; i < aliasesSize; i++) {
     AliasMetaData aliasMd = AliasMetaData.Builder.readFrom(in);
     builder.putAlias(aliasMd);
   }
   int customSize = in.readVInt();
   for (int i = 0; i < customSize; i++) {
     String type = in.readUTF();
     Custom customIndexMetaData = lookupFactorySafe(type).readFrom(in);
     builder.putCustom(type, customIndexMetaData);
   }
   return builder.build();
 }