code: public ChronicleMapBuilder<K, V> defaultValueProvider(
              @NotNull DefaultValueProvider<K, V> defaultValueProvider) {
          Objects.requireNonNull(defaultValueProvider);
          this.defaultValueProvider = defaultValueProvider;
          return this;
      }
docs: Specifies the function to obtain a value for the key during {@link ChronicleMap#acquireUsing
  acquireUsing()} calls, if the key is absent in the map, created by this builder.
  <p>
  <p>This is a <a href="#jvm-configurations">JVM-level configuration</a>.
  
  @param defaultValueProvider the strategy to obtain a default value by the absent key
  @return this builder back