The field setting “Include in filters” allows the field to be added as a filter for content (see Channels Configuration) and the field values to be edited in the Batch Editor (indexed fields). Picturepark checks this setting against the allowed number of Search-indexed fields in your subscription plan. While it may be tempting to include all fields in filters and simple search also boosting them, you may revisit this idea based on your subscription plan limit, and by testing your common search scenarios - too much values will not automatically result in better search results.