> ## Documentation Index
> Fetch the complete documentation index at: https://doc.lucidworks.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Resolve Multivalued Fields

> Index pipeline stage configuration specifications

export const schema = {
  "type": "object",
  "title": "Resolve Multivalued Fields",
  "description": "Resolve multivalued fields into a single value based on rules",
  "properties": {
    "skip": {
      "type": "boolean",
      "title": "Skip This Stage",
      "description": "Set to true to skip this stage.",
      "default": false,
      "hints": ["advanced"]
    },
    "label": {
      "type": "string",
      "title": "Label",
      "description": "A unique label for this stage.",
      "hints": ["advanced"],
      "maxLength": 255
    },
    "condition": {
      "type": "string",
      "title": "Condition",
      "description": "Define a conditional script that must result in true or false. This can be used to determine if the stage should process or not.",
      "hints": ["code", "code/javascript", "advanced"]
    },
    "typeStrategy": {
      "type": "array",
      "title": "Type Strategies",
      "description": "Mapping of types to a strategy. These supersede field strategies.",
      "items": {
        "type": "object",
        "required": ["type", "resolverStrategy"],
        "properties": {
          "type": {
            "type": "string",
            "title": "Type Name",
            "enum": ["integer", "long", "float", "double", "string"]
          },
          "resolverStrategy": {
            "type": "string",
            "title": "Resolver Strategy",
            "enum": ["pick_first", "pick_last", "pick_by_creator", "concatenate_unique", "pick_min", "pick_max", "default"],
            "default": "pick_first"
          }
        }
      }
    },
    "fieldStrategy": {
      "type": "array",
      "title": "Field Strategies",
      "description": "Mapping of fields to a strategy",
      "items": {
        "type": "object",
        "required": ["fieldName", "resolverStrategy"],
        "properties": {
          "fieldName": {
            "type": "string",
            "title": "Field Name"
          },
          "resolverStrategy": {
            "type": "string",
            "title": "Resolver Strategy",
            "enum": ["pick_first", "pick_last", "pick_by_creator", "concatenate_unique", "pick_min", "pick_max", "default"],
            "default": "pick_first"
          }
        }
      }
    },
    "creatorStrategy": {
      "type": "array",
      "title": "Creator Strategies",
      "description": "Mapping of fields to a 'creator' name. These only apply if you create a type or field strategy with PICK_BY_CREATOR value.",
      "items": {
        "type": "object",
        "required": ["fieldName", "creatorName"],
        "properties": {
          "fieldName": {
            "type": "string",
            "title": "Field Name"
          },
          "creatorName": {
            "type": "string",
            "title": "Creator Name"
          }
        }
      }
    }
  },
  "category": "Field Transformation",
  "categoryPriority": 7,
  "unsafe": false
};

export const SchemaParamFields = ({schema}) => {
  const sanitize = str => {
    if (typeof str !== "string") return str;
    return str.replace(/^"(.*)"$/s, "$1").replace(/\\/g, "").replace(/"/g, "'");
  };
  const formatDescription = str => {
    const s = sanitize(str);
    return (/[.!?]\)*$/).test(s) ? s : `${s}.`;
  };
  const {description, properties = {}, required: requiredProps = []} = schema;
  const visibleProps = useMemo(() => Object.entries(properties).filter(([, prop]) => !prop.hints?.includes("hidden")), [properties]);
  return <div>
      {description && <p>{formatDescription(description)}</p>}

      {visibleProps.map(([name, prop]) => {
    const isRequired = requiredProps.includes(name);
    const hasDefault = prop.default !== undefined;
    const rawDefault = prop.default;
    const isComplexDefault = hasDefault && (typeof rawDefault === "object" || typeof rawDefault === "string" && (rawDefault.length > 20 || rawDefault.includes('"')));
    const fieldProps = {
      key: name,
      body: prop.title || name,
      type: prop.type,
      ...prop.title && ({
        post: [<><span className="text-stone-400 dark:text-stone-500">API property: </span>{name}</>]
      }),
      ...isRequired && ({
        required: true
      }),
      ...!isComplexDefault && hasDefault ? {
        default: sanitize(String(rawDefault))
      } : {}
    };
    const isObject = prop.type === "object" && prop.properties;
    const isArrayOfObjects = prop.type === "array" && prop.items?.type === "object" && prop.items.properties;
    return <ParamField {...fieldProps}>
            {prop.description && <p>{formatDescription(prop.description)}</p>}

            {isComplexDefault && <div className="flex">
                <p>
                  <strong>Default:</strong>
                </p>
                <pre className="!my-0">
                  <code>
                    {JSON.stringify(rawDefault, null, 2)}
                  </code>
                </pre>
              </div>}

            {isArrayOfObjects && <div className="flex">
              <p>
                <strong>Object attributes:</strong>
              </p>
              <pre className="!my-0">
                <code>
                  {'{\n'}
                  {Object.entries(prop.items.properties).map(([iname, iprop]) => <>
                      {`  ${iname}`}
                      {prop.items?.required?.includes(iname) && <span style={{
      color: 'red'
    }}> required</span>}
                      {`: {\n    display name: ${sanitize(iprop.title || '')}\n    type: ${iprop.type}\n  }\n`}
                    </>)}
                  {'}'}
                </code>
              </pre>
              </div>}

            {isObject && <Expandable title="properties">
                <SchemaParamFields schema={{
      properties: prop.properties,
      required: prop.required
    }} />
              </Expandable>}
          </ParamField>;
  })}
    </div>;
};

export const LwTemplate = ({title = "Key questions to get you started", icon = "sparkles", cta = "Powered by Agent Studio", linkHref = "https://lucidworks.com/demo/?utm_source=docs&utm_medium=referral&utm_campaign=docs_cta_ai"}) => {
  const [isLoaded, setIsLoaded] = useState(false);
  useEffect(() => {
    const timer = setTimeout(() => {
      setIsLoaded(true);
    }, 500);
    return () => clearTimeout(timer);
  }, []);
  return <div className="lw-template-container">
      <Card title={title} icon={icon}>
        {isLoaded && <span dangerouslySetInnerHTML={{
    __html: `<lw-template id="a029c1a9-28be-427e-b0e1-5d918920246a"></lw-template
            >`
  }} />}
        <Link href={linkHref} className="agent-studio-link text-left text-gray-600 gap-2 dark:text-gray-400 text-sm font-medium flex flex-row items-center hover:text-primary dark:hover:text-primary-light group-hover:text-primary group-hover:dark:text-primary-light">Powered by Lucidworks Agent Studio</Link>
      </Card>
    </div>;
};

[localhost link]: http://localhost:3000/docs/lucidworks-search/09-developer-documentation/config-specs/index-pipeline-stages/resolve-multivalued-fields

[mintlify link]: https://doc.lucidworks.com/docs/lucidworks-search/09-developer-documentation/config-specs/index-pipeline-stages/resolve-multivalued-fields

[old doc.lw link]: https://doc.lucidworks.com/managed-fusion/5.9/yi8wp7

The Resolve Multivalued Fields stage (previously called the Multi-Value Resolver stage) allows you to choose one value from a set of one or more field values using a set of pre-defined rules, based on either field name or field type.
For each field name or field type rule, a strategy is defined. There are 6 available strategies:

* DEFAULT: leave all values intact. This may cause problems if a field or dynamic field rule is not defined as multi-valued in the schema.
* PICK\_FIRST: choose the first value and discard all others.
* PICK\_LAST: choose the last value and discard all others.
* PICK\_BY\_CREATOR: based on the name of the "creator" metatdata, choose the name of 'creator' as defined in the creatorStrategy property for the field name. Only the last matching value will be retained.
* CONCATENATE\_UNIQUE: choose to concatenate unique string values with a single space separator.
* PICK\_MIN: choose the minimum value and discard all others. If the values are non-numeric, then all non-numeric values will be discarded.
* PICK\_MAX: choose the maximum value and discard all others. If the values are non-numeric, then all non-numeric values will be discarded.

<LwTemplate />

## Configuration

<Tip>
  When entering configuration values in the UI, use *unescaped* characters, such as `\t` for the tab character. When entering configuration values in the API, use *escaped* characters, such as `\\t` for the tab character.
</Tip>

<SchemaParamFields schema={schema} />