Simple aspx script to view or rebuild examine indexes for Umbraco 7 on Azure web app multiple instances autoscaled. Supporting blog post with screenshot - http://andrew.lansdowne.me/2022/06/17/how-to-check-and-rebuild-on-each-node-of-an-umbraco-azure-autoscaled-web-app/

rebuild.aspx

<%@ Page language="c#" %>

<script runat="server" language="c#">
    protected void Rebuild(object sender, System.EventArgs e){
        if (machineName.Text == Environment.MachineName) {
            var index = Examine.ExamineManager.Instance.IndexProviderCollection[indexName.Text];
            if (index != null) {
                index.RebuildIndex();
                Response.Write("<h1>Triggered rebuild of " + index.Name + " on " + Environment.MachineName + "</h1>");
            } else {
                Response.Write("<h1>Index '" + indexName.Text + "' not found on " + Environment.MachineName + "</h1>");
            }
        }
        else {
            Response.Write("<h1>Try again, machine name is not '" + machineName.Text + "'</h1>");
        }
    }
</script>

<h1>Examine maintenance page</h1>
<p>
Machine name: <%=Environment.MachineName %>
</p>
<h2>Indexes</h2>
<% 
        foreach (Examine.Providers.BaseIndexProvider index in Examine.ExamineManager.Instance.IndexProviderCollection)
        {
            var indexer = index as Examine.LuceneEngine.Providers.LuceneIndexer;
            var directory = indexer.GetLuceneDirectory();
            var reader = Lucene.Net.Index.IndexReader.Open(directory, true);
            var noOfDocs = reader.MaxDoc();
            Response.Write(index.Name + " = " + noOfDocs + "<br>");
        }
%>

<h2>Rebuild tool</h2>
<form runat="server">
<p>
Machine name: <asp:textbox runat="server" id="machineName"/>
</p>
<p>
Index: <asp:textbox runat="server" id="indexName"/>
</p>
<asp:button runat="server" id="btnRebuild" Text="Rebuild index" onclick="Rebuild"/>
<asp:button runat="server" Text="Refresh page" />
</form>