[CALCITE-4948] Revert Elasticsearch to 7.10.2

Remove extra maven repository.

elasticsearch/build.gradle.kts

@@ -18,12 +18,6 @@ plugins {
     id("com.github.vlsi.gradle-extensions")
 }
 
-repositories {
-    maven {
-        setUrl("https://maven.codelibs.org/")
-    }
-}
-
 dependencies {
     api(project(":core"))
     api(project(":linq4j"))
@@ -44,7 +38,6 @@ dependencies {
     testImplementation("org.apache.logging.log4j:log4j-api")
     testImplementation("org.apache.logging.log4j:log4j-core")
     testImplementation("org.codelibs.elasticsearch.module:lang-painless")
-    testImplementation("org.codelibs.elasticsearch.module:scripting-painless-spi")
     testImplementation("org.elasticsearch.plugin:transport-netty4-client")
     testImplementation("org.elasticsearch:elasticsearch")
     testImplementation(project(":testkit"))

gradle.properties

@@ -90,7 +90,9 @@ commons-io.version=2.4
 commons-lang3.version=3.8
 commons-pool2.version=2.6.2
 dropwizard-metrics.version=4.0.5
-elasticsearch.version=7.15.2
+
+# do not upgrade this, new versions are Category X license.
+elasticsearch.version=7.10.2
 embedded-redis.version=0.6
 esri-geometry-api.version=2.2.0
 foodmart-data-hsqldb.version=0.3