--data-binary @fess-documents.json
```

#### Index Settings Migration

Fess uses OpenSearch/Elasticsearch internally, so you can:

1. Export index mappings and settings from source
2. Apply custom analyzers in Fess's `fess_config.properties`
3. Create synonym dictionaries in Fess's dictionary directory

---

### Apache Solr

For migrating from Apache Solr:

#### Document Export and Import

{1,9}|x|X|zz?|ZZ?|.)/g,x=/(\[[^\[]*\])|(\\)?(LTS|LT|LL?L?L?|l{1,4})/g,P={},O={};function W(e,a,t,s){var n="string"==typeof s?function(){return this[s]()}:s;e&&(O[e]=n),a&&(O[a[0]]=function(){return H(n.apply(this,arguments),a[1],a[2])}),t&&(O[t]=function(){return this.localeData().ordinal(n.apply(this,arguments),e)})}function A(e,a){return e.isValid()?(a=E(a,e.localeData()),P[a]=P[a]||function(s){for(var e,n=s.match(j),a=0,r=n.length;a<r;a++)O[n[a]]?n[a]=O[n[a]]:n[a]=(e=n[a]).match(/\[[\s\S]/)?e...

a,create:l}=Object,{apply:c,construct:s}="undefined"!=typeof Reflect&&Reflect;i||(i=function(e){return e}),a||(a=function(e){return e}),c||(c=function(e,t){for(var n=arguments.length,o=new Array(n>2?n-2:0),r=2;r<n;r++)o[r-2]=arguments[r];return e.apply(t,o)}),s||(s=function(e){for(var t=arguments.length,n=new Array(t>1?t-1:0),o=1;o<t;o++)n[o-1]=arguments[o];return new e(...n)});const u=D(Array.prototype.forEach),m=D(Array.prototype.lastIndexOf),p=D(Array.prototype.pop),f=D(Array.prototype.push),...

{return function i(n){const o=t.querySelectorAll(e);for(let{target:r}=n;r&&r!==this;r=r.parentNode)for(const a of o)if(a===r)return $(n,{delegateTarget:r}),i.oneOff&&F.off(t,n.type,e,s),s.apply(r,[n])}}(t,s,r):function(t,e){return function s(i){return $(i,{delegateTarget:t}),s.oneOff&&F.off(t,i.type,e),e.apply(t,[i])}}(t,r);u.delegationSelector=o?s:null,u.callable=r,u.oneOff=n,u.uidEvent=d,c[d]=u,t.addEventListener(a,u,o)}function x(t,e,s,i,n){const o=D(e[s],i,n);o&&(t.removeEventListener(s,o,Boolean(n)),delete...

     * The boost value affects how highly the document will rank in search results.
     *
     * @param map the document data map to add the boost value to
     * @param documentBoost the boost value to apply to the document
     */
    protected void addBoostValue(final Map<String, Object> map, final float documentBoost) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

eProperty(t,"prototype",{writable:!1}),t}function r(){return r=Object.assign?Object.assign.bind():function(t){for(var e=1;e<arguments.length;e++){var n=arguments[e];for(var i in n)Object.prototype.hasOwnProperty.call(n,i)&&(t[i]=n[i])}return t},r.apply(this,arguments)}function u(t,e){return u=Object.setPrototypeOf?Object.setPrototypeOf.bind():function(t,e){return t.__proto__=e,t},u(t,e)}var f="transitionend";var d={TRANSITION_END:"bsTransitionEnd",getUID:function(t){do{t+=~~(1e6*Math.random())}w...

        }
    }

    /**
     * Applies LDAP attributes to a user object.
     *
     * @param user the user object to populate with LDAP attributes
     */
    public void apply(final User user) {
        if (!fessConfig.isLdapAdminEnabled(user.getName())) {
            return;
        }

        final Supplier<Hashtable<String, String>> adminEnv = this::createAdminEnv;

            protected boolean tryStartOperation(final String operationName, final String data, final int remainingRetries) {
                // Simulate: create always fails (no OpenSearch)
                // Then apply the retry logic from the real implementation
                if (remainingRetries <= 0) {
                    return false;
                }
                return tryCleanupAndRetry(operationName, data, remainingRetries);

on","isDelegated","typeEvent","getTypeEvent","addHandler","oneOff","wrapFunction","relatedTarget","delegateTarget","call","this","handlers","previousFunction","domElements","querySelectorAll","domElement","hydrateObj","EventHandler","off","type","apply","bootstrapDelegationHandler","bootstrapHandler","removeHandler","Boolean","removeNamespacedHandlers","namespace","storeElementEvent","handlerKey","entries","includes","on","one","inNamespace","isNamespace","startsWith","elementEvent","slice","key...

$.formUtils.addAsyncValidator() instead"),d.loadInstance(a,b,c)},addAsyncValidator:function(b){var c=a.extend({},b),e=c.validatorFunction;c.async=!0,c.validatorFunction=function(a,b,f,g,h,i){var j=d.loadInstance(this.name,b,h);return j.run(i,function(d){e.apply(c,[d,a,b,f,g,h,i])})},this.addValidator(c)}}),a(b).bind("validatorsLoaded formValidationSetup",function(b,c){c||(c=a("form")),c.find("[data-validation]").each(function(){var b=a(this);b.valAttr("async",!1),a.each(a.split(b.attr("data-validation")),function(c,d){var...