Add collection update API.

src/main/java/org/typesense/api/ApiCall.java

@@ -171,15 +171,15 @@ <T, R> T put(String endpoint, R body, Class<T> resourceClass) throws Exception {
         return makeRequest(endpoint, r, resourceClass);
     }
 
-    <T, R> T patch(String endpoint, R body) throws Exception {
+    <T, R> T patch(String endpoint, R body, Class<T> resourceClass) throws Exception {
 
         RequestHandler r = (String REST_URI) -> this.client.target(REST_URI)
                 .request(MediaType.APPLICATION_JSON)
                 .header(API_KEY_HEADER, apiKey)
                 .build("PATCH", Entity.entity(body, MediaType.APPLICATION_JSON))
                 .invoke();
 
-        return makeRequest(endpoint, r, null);
+        return makeRequest(endpoint, r, resourceClass);
     }
 
 

src/main/java/org/typesense/api/Collection.java

@@ -2,6 +2,7 @@
 
 import org.typesense.api.exceptions.TypesenseError;
 import org.typesense.model.CollectionResponse;
+import org.typesense.model.CollectionUpdateSchema;
 
 import java.util.HashMap;
 
@@ -41,6 +42,10 @@ public CollectionResponse retrieve() throws Exception {
         return this.apiCall.get(endpoint, CollectionResponse.class);
     }
 
+    public CollectionUpdateSchema update(CollectionUpdateSchema c) throws Exception {
+        return this.apiCall.patch(endpoint, c, CollectionUpdateSchema.class);
+    }
+
     public CollectionResponse delete() throws Exception {
         return this.apiCall.delete(endpoint,CollectionResponse.class);
     }

src/main/java/org/typesense/api/Document.java

@@ -18,16 +18,16 @@ public class Document {
         this.endpoint = Collections.RESOURCE_PATH + "/" +  this.collectionName + Documents.RESOURCE_PATH + "/" + this.documentId;
     }
 
-    HashMap<String,Object> retrieve() throws Exception {
+    public HashMap<String,Object> retrieve() throws Exception {
         return this.apiCall.get(endpoint);
     }
 
-    HashMap<String, Object> delete() throws Exception {
+    public HashMap<String, Object> delete() throws Exception {
         return this.apiCall.delete(this.endpoint);
     }
 
-    HashMap<String , Object> update(HashMap<String, Object> document) throws Exception {
-        return this.apiCall.patch(this.endpoint, document);
+    public HashMap<String , Object> update(HashMap<String, Object> document) throws Exception {
+        return this.apiCall.patch(this.endpoint, document, HashMap.class);
     }
 
 }

src/main/java/org/typesense/model/CollectionUpdateSchema.java

@@ -0,0 +1,70 @@
+package org.typesense.model;
+
+import java.util.ArrayList;
+import java.util.List;
+import org.typesense.model.Field;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import javax.xml.bind.annotation.XmlElement;
+import javax.xml.bind.annotation.XmlRootElement;
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.XmlType;
+import javax.xml.bind.annotation.XmlEnum;
+import javax.xml.bind.annotation.XmlEnumValue;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.annotation.JsonCreator;
+
+public class CollectionUpdateSchema   {
+
+  @Schema(example = "[{\"name\":\"company_name\",\"type\":\"string\",\"facet\":false},{\"name\":\"num_employees\",\"type\":\"int32\",\"facet\":false},{\"name\":\"country\",\"type\":\"string\",\"facet\":true}]", required = true, description = "A list of fields for querying, filtering and faceting")
+ /**
+   * A list of fields for querying, filtering and faceting  
+  **/
+  private List<Field> fields = new ArrayList<Field>();
+ /**
+   * A list of fields for querying, filtering and faceting
+   * @return fields
+  **/
+  @JsonProperty("fields")
+  public List<Field> getFields() {
+    return fields;
+  }
+
+  public void setFields(List<Field> fields) {
+    this.fields = fields;
+  }
+
+  public CollectionUpdateSchema fields(List<Field> fields) {
+    this.fields = fields;
+    return this;
+  }
+
+  public CollectionUpdateSchema addFieldsItem(Field fieldsItem) {
+    this.fields.add(fieldsItem);
+    return this;
+  }
+
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("class CollectionUpdateSchema {\n");
+
+    sb.append("    fields: ").append(toIndentedString(fields)).append("\n");
+    sb.append("}");
+    return sb.toString();
+  }
+
+  /**
+   * Convert the given object to string with each line indented by 4 spaces
+   * (except the first line).
+   */
+  private static String toIndentedString(java.lang.Object o) {
+    if (o == null) {
+      return "null";
+    }
+    return o.toString().replace("\n", "\n    ");
+  }
+}

src/main/java/org/typesense/model/Field.java

@@ -29,6 +29,18 @@ public class Field   {
 
   @Schema(example = "true", description = "")
   private Boolean index = true;
+
+  @Schema(example = "el", description = "")
+  private String locale = null;
+
+  @Schema(example = "true", description = "")
+  private Boolean sort = false;
+
+  @Schema(example = "true", description = "")
+  private Boolean infix = false;
+
+  @Schema(example = "true", description = "")
+  private Boolean drop = null;
  /**
    * Get name
    * @return name
@@ -119,6 +131,78 @@ public Field index(Boolean index) {
     return this;
   }
 
+ /**
+   * Get locale
+   * @return locale
+  **/
+  @JsonProperty("locale")
+  public String getLocale() {
+    return locale;
+  }
+
+  public void setLocale(String locale) {
+    this.locale = locale;
+  }
+
+  public Field locale(String locale) {
+    this.locale = locale;
+    return this;
+  }
+
+ /**
+   * Get sort
+   * @return sort
+  **/
+  @JsonProperty("sort")
+  public Boolean isSort() {
+    return sort;
+  }
+
+  public void setSort(Boolean sort) {
+    this.sort = sort;
+  }
+
+  public Field sort(Boolean sort) {
+    this.sort = sort;
+    return this;
+  }
+
+ /**
+   * Get infix
+   * @return infix
+  **/
+  @JsonProperty("infix")
+  public Boolean isInfix() {
+    return infix;
+  }
+
+  public void setInfix(Boolean infix) {
+    this.infix = infix;
+  }
+
+  public Field infix(Boolean infix) {
+    this.infix = infix;
+    return this;
+  }
+
+ /**
+   * Get drop
+   * @return drop
+  **/
+  @JsonProperty("drop")
+  public Boolean isDrop() {
+    return drop;
+  }
+
+  public void setDrop(Boolean drop) {
+    this.drop = drop;
+  }
+
+  public Field drop(Boolean drop) {
+    this.drop = drop;
+    return this;
+  }
+
 
   @Override
   public String toString() {
@@ -130,6 +214,10 @@ public String toString() {
     sb.append("    optional: ").append(toIndentedString(optional)).append("\n");
     sb.append("    facet: ").append(toIndentedString(facet)).append("\n");
     sb.append("    index: ").append(toIndentedString(index)).append("\n");
+    sb.append("    locale: ").append(toIndentedString(locale)).append("\n");
+    sb.append("    sort: ").append(toIndentedString(sort)).append("\n");
+    sb.append("    infix: ").append(toIndentedString(infix)).append("\n");
+    sb.append("    drop: ").append(toIndentedString(drop)).append("\n");
     sb.append("}");
     return sb.toString();
   }